• Home
  • E-Submission
  • Sitemap
  • Contact Us
Asian-Australas J Anim Sci. Search


Go to Top Go to Bottom
Asian-Australas J Anim Sci > Volume 32(8); 2019 Special Issue > Article
Mamuad, Lee, and Lee: Recent insight and future techniques to enhance rumen fermentation in dairy goats


Recent development of novel techniques in systems biology have been used to improve and manipulate the rumen microbial ecosystem and gain a deeper understanding of its physiological and microbiological interactions and relationships. This provided a deeper insight and understanding of the relationship and interactions between the rumen microbiome and the host animal. New high-throughput techniques have revealed that the dominance of Proteobacteria in the neonatal gut might be derived from the maternal placenta through fetal swallowing of amniotic fluid in utero, which gradually decreases in the reticulum, omasum, and abomasum with increasing age after birth. Multi “omics” technologies have also enhanced rumen fermentation and production efficiency of dairy goats using dietary interventions through greater knowledge of the links between nutrition, metabolism, and the rumen microbiome and their effect in the environment. For example, supplementation of dietary lipid, such as linseed, affects rumen fermentation by favoring the accumulation of α-linolenic acid biohydrogenation with a high correlation to the relative abundance of Fibrobacteriaceae. This provides greater resolution of the interlinkages among nutritional strategies, rumen microbes, and metabolism of the host animal that can set the foundation for new advancements in ruminant nutrition using multi ‘omics’ technologies.


The rumen has a diverse and complex microbial ecosystem that converts ingested plant biomass into proteins, volatile fatty acids (VFAs), and vitamins to be used by the host animal. Studying the relationships and interactions of microbes in the rumen is difficult as different microbes have different substrates, requirements, and digestive roles. However, understanding the relationships and interactions between microbes is important for evaluating their effects on the environment or in the community they inhabit, as they play a pivotal role in animal health, performance, milk [1], and meat quality and composition. High-throughput novel “omics” systems biology techniques, such as genomics, transcriptomics, proteomics, and metabolomics, enable researchers to analyze biological molecules and profile microorganisms in detail to understand the rumen microbial community structure, metabolic potential, and activity.
The goat is smaller than other ruminants, such as cattle; hence, they are categorized as small ruminants. The goat rumen also has a different motility pattern than that of cattle as it has reticular motility during rest by a biphasic contraction and longer duration of reticular regurgitation contraction [2]. Goat rumen improvement could be achieved via elevated production of microbial crude protein in the rumen microbiota through dietary interventions and supplementation with prebiotics, probiotics, and/or enzymes. However, even with the vast increase in livestock products, animal scientists and nutritionists are still exploring ways to improve ruminant nutrition to meet the demands of a growing human population coupled with increasing economic wealth. Animal scientists and nutritionists use several approaches to meet these demands. One of these approaches is modulating rumen nutrition through dietary interventions, the use of prebiotics and probiotics, and recent omics technologies, which have helped to elucidate insight into the microbiota dynamics of the goat rumen, as well as the other stomach compartments, such as reticulum, omasum, and abomasum. The objective of this review is to summarize recent insights and the potential of future techniques in enhancing rumen fermentation in dairy goats.


The goat rumen varies in pH, microbiome, fermentation products, and metabolites depending on the diet ingested by the animal. On a high forage diet study of Lee et al [3] with commercial concentrate mix and rice straw in the ratio of 9:1, the goat rumen had a pH of 6.25, while on a high grain diet (animals were only fed with concentrate for 1 week) it had a pH of 5.90 [4]. However, the ruminal pH of lactating Nubian goats fed with 500 g Egyptian berseem clover and 500 g concentrate feed mixture [5], 400 g Egyptian berseem clover and 600 g concentrate feed mixture [6] and Saanen [7] goats fed with 50:50 forage to concentrate ratio was 6.00 to 6.13 and 6.17, respectively. Usually, ruminal pH is correlated with the concentrations of VFAs. In the study of Kholif et al [5] and Kholif et al [6], lactating Nubian goat rumens have 26.9 g/L [5] to 29.2 g/L [6] ammonia nitrogen and 82.0 mmol/L VFA with acetate, propionate, and butyrate concentrations of 59.0, 26.4, and 2.25 mmol/100 mmol VFA [5], respectively. The rumen of Korean native goats on high forage and concentrate diets have comparable ammonia nitrogen and total VFA, and only differ in acetate production, which is higher on a high forage diet [4].
Goat rumen microbiota composition is usually dominated by Bacteroidetes followed by Firmicutes with a very low abundance of Fibrobacteres [3,79]. Contrastingly, Cremonesi et al [1] reported that the rumen composition of Alpine dairy goats was dominated by Bacteroidetes with about 61.2% relative abundance, followed by Firmicutes, Proteobacteria, and Verrucomicrobia at 24.2%, 4.1%, and 3.3% relative abundances, respectively. Conversely, Bacteroidetes and Firmicutes were the predominant bacterial phyla while Clostridia and Bacteroides, were the dominant classes in Moxoto dairy female goats [10]. Meanwhile, the archaeal diversity of alpine dairy goats was dominated by Methanobacteriaceae and Methanomassiliicoccaceae with relative abundances of 36.8% and 37.1%, respectively [1], while Methanobrevibacter and Methanosphaera were found in Moxoto dairy female goats [10].
Operational taxonomic units of Bacteria and Archaea in Korean native goats are comparatively lower than those in Holstein cows and Hanwoo steers, which indicates that Korean native goats contain fewer bacterial and archaeal species [3]. On the contrary, a higher rumen microbial diversity in Korean native goats compared with Holstein and Hanwoo cows was reported by Lee et al [4] based on the Shannon diversity index and Inverse-Simpson index using T-RFLP analysis. Using high-throughput sequencing techniques, Henderson et al [11] reported that rumen protozoal community structure had a strong host individuality, wherein they were dominated by Entodinium and Epidinium. They also reported that the Ophryoscolex genus, which had a wider host distribution, was found in goats from 18 countries. In accordance, Lee et al [3] reported that goats have ~104/mL copies of the 18S protozoa rRNA gene. In addition, Wang et al [9] explored the rumen microbiome of 55 male crossbred goats in 11 different age groups and found that the bacterial communities were mainly composed of Bacteroidetes, Firmicutes, and Proteobacteria, with Euryarchaeota and Thaumarchaeota in Archaea. Fibrobacter succinogenes had the highest relative abundance in the rumens of goats on a high forage diet with 2.187 compared to those on a high grain diet and to Hanwoo and Holstein cattle using quantitative real-time polymerase chain reaction [4].
Insight into the reticulum, omasum, and abomasum microbiota dynamics in pre-weaning goats has also been elucidated using metagenomics. Proteobacteria are facultative anaerobes, which dominate the neonatal gut owing to the unique abundance of oxygen. Studies have shown that Proteobacteria species may be derived from the maternal placenta through fetal swallowing of amniotic fluid in utero. It was also reported that Proteobacteria gradually decreased in the reticulum, omasum, and abomasum with the aging of the host [12]. Lerma-Reyes et al [13] reported that the reticulum, omasum, and abomasum were found to represent the primary, secondary, and third maturation stages of ruminant stomach compartments in early life. The primary stage occurs during the first two weeks after birth and exposure to foreign microorganisms, followed by the secondary stage (day 14 to 28 after birth), which is a period of microbial transition. Finally, the third stage (day 28 after birth and beyond) is the exogenous and endogenous microbial colonization stage [12].


Diet composition plays a pivotal role in the composition of ruminal microbiota, which defines ruminant products. The conjugated linoleic acid (CLA) in milk originates from either endogenous synthesis in the mammary gland from vaccenic acid or ruminal biohydrogenation of linoleic acid as an intermediate product [13]. Moreover, linseed induced fatty acid concentration shifts from C18:2n−6 to C18:3n−3 (α-linolenic acid [ALA]) with biohydrogenation. The fatty acid involved in the biohydrogenation pathway of ALA was reported to have the highly significant correlation with Fibrobacteriaceae [1], wherein Fibrobacter succinogenes is one of the most abundant saturated fatty acids characterizing principal species that produce C18:0 (stearic acid). Fibrobacter succinogenes also plays a role in the detoxification of the ruminal environment by using C18:3n−3 for its metabolism and producing C18:0 [1]. Dewanckele et al [14] added that the most important biohydrogenating bacteria are Butyrivibrio species, which have higher relative abundances when the reduction to C18:0 is inhibited.
Lipid supplementation of linseed increases the relative abundances of Succinivibrio spp. by 50% and Fibrobacter spp. by 75%. Consequently, linseed supplementation reduces the level of Prevotella spp. and dimethyl acetals (DMA), which are thought to play a role in plasmalogens [1]. This is because DMA is produced through acidic transesterification of fatty aldehydes, which are released from plasmalogens. The DMA are microbial membrane and cell wall structural lipids that regulate optimal fluidity of the membrane. Plasmalogens are one of the important classes of ruminal lipids that are present in large amounts in the membranes of anaerobic bacteria and are strictly related to bacterial metabolism. Plasmalogen content and composition of rumen microbes can be modified depending on their response to different environmental stimuli and microbial diversity [1].


Methane is one of the products of normal fermentation of feedstuffs in the rumen. When methane is produced, the ruminant suffers a loss of ingested feed-derived energy of approximately 2% to 12%, depending on geographical location, feed quality, feed intake, feed composition, the processing of feed, and ruminant species [3,11,15]. Methane is produced by methanogens through enteric fermentation or methanogenesis. Methanogens are predominant among rumen Archaea, which belong to the phylum Euryarchaeota, and their populations differ depending on the species of the ruminant. Pseudomurein in Methanobrevibacter and Methanobacterium, heteropolysaccharide in Methanosarcina, and protein in Methanomicrobium form the cell wall of methanogens [15]. Methanogens use carbon dioxide and hydrogen, formate, methylamines, methanol, or acetate as the substrate to produce methane depending on their species and cell wall composition.
Pragna et al [16] reported that enteric methane can be mitigated through three mechanisms: targeting end products of digestion to propionate, providing alternate hydrogen sinks, and selectively inactivating rumen methanogens. These mechanisms decrease methane production through several strategies: dietary composition (by increasing starch, decreasing cell wall components, and grinding), lipids (fatty acids, oils, seeds, and tallow), defaunation (chemical and feed additives), methanogen vaccine, monensin, plant compounds (condensed tannins, saponins, and essential oils), or organic acids (fumarate or malate) [15]. Methane production was reduced by essential oils that directly inhibited methanogenic archaea [8].
Feed intake and feeding level are two of the factors that affect methane production in ruminants such as goats. Methane production in goats increases linearly with increased feeding level when expressed in g/d and g/kg body weight0.75 with 8.5, 10.3, and 11.2 g/d at feeding levels of 1.5%, 2.0%, and 2.5%, respectively [17]. However, the opposite is observed when methane production is expressed in g/kg dry matter intake, g/kg organic matter intake, and % gross energy intake. Zhou et al [18] reported that cattle with low feed efficiencies produced more methane gas and their methanogenic composition had more species variation (27 operational taxonomic units) and diversity (0.84 diversity index) than cattle with high feed efficiencies, which had less methane and lower methanogenic composition (22 operational taxonomic units and 0.42 diversity index). Zhou et al [18] also added that inefficient cattle have higher prevalence of Methanosphaera stadtmanae and Methanobrevibacter sp. strain AbM4 (1.92 and 2.26 times higher, respectively). Methane production can also be decreased by supplements of fumaric acid and tannins. Tannins can interfere with the membranes of rumen bacteria, and mitigate methane production, while fumaric acid stimulates the fumarate-utilizing bacteria, which increases propionate resulting in decreased methane production [19]. In addition, Mitsumori et al [20] reported that administration of 5 g of bromochloromethane-cyclodextrin/100 kg live weight of Japanese goats leads to 91% reduction in methane. Bromochloromethane-cyclodextrin showed dose-dependent methane mitigation in ruminants, shifting toward more propionic production and increased abundances of Prevotella spp., Selenomonas spp., and Fibrobacter succinogenes [20,21]. In addition, bromochloromethane-cyclodextrin administered to Japanese goats decreased methanogen diversity in the rumen with only 27% sequence data shared with control goats [21].


Dietary interventions can be plant-based, mushroom-based, dietary lipids, alternative energy sources, enzymes, or acids (Figure 1). These dietary interventions can be used individually or in combination depending on the farmer’s choice. These dietary interventions affect animal performance, milk, and milk production.

Increasing milk production and quality through dietary interventions

The use of rich sources of linoleic and ALA is essential in increasing the healthy properties of milk, because they favor the accumulation of CLA. Several studies have reported the positive effect of CLA in animals and humans. Consumption of CLA had been reported to have an effect on the immune system, atherosclerosis, and bone health [22]. The CLA in milk fat is also enhanced by lemongrass [23], Moringa oleifera [6,24], rosemary [23], sunflower seed linseed [1], by-products such as pistachio hulls [22], pomegranate seed pulp [22], and tomato pomace [22], and by oil-based supplements such as flaxseed oil [5], canola oil [13], soybean oil [13], and sunflower seeds oil [25] (Table 1). This improvement in the nutritional quality of milk can be attributed to the presence of Butyrivibrio fibrisolvens, which was found to increase after supplements of soybean oil [26]. Cremonesi et al [1] also reported that the Butyrivibrio group, which includes the genera Butyrivibrio and Pseudobutyrivibrio, were involved in the process of biohydrogenation.
Dietary interventions recently reported to be effective in increasing milk production include crude glycerin [27], exogenous fibrolytic enzyme (cellulase) [28], flaxseed oil [5], humic acid [29], lemongrass [23], Moringa oleifera [6,24], rosemary [23], sunflower seed and oil [25], and Ziziphus mauritiana [30] (Table 1). Also, goat milk quality can be improved by olive oil by-products plus sunflower oil [31], tomato silage plus sunflower oil [31], exogenous fibrolytic enzyme (cellulase) [28], humic acid [29], purple corn stover [32], and organic selenium [33].
Fatty acid profiles of ruminant products such as milk can be improved through changes in animal diet. Supplements of fish oil and plant oils in goat diets interact to modulate milk fat composition without decreasing milk fat content [34]. Hence, a diet with sunflower seed oil [25] was reported to increase milk fat content together with cottonseed cake [30], crude glycerin [27], Grewia oppositifolia [30], lemongrass [23], rosemary [23], and sunflower seed. The addition of lemongrass [23], rosemary [23], sunflower seed [25], flaxseed oil [5], rapeseed oil [35], sunflower seed oil [25], and hydrolyzable tannins [35] to the diet increases the total unsaturated fatty acids. Thoh et al [27] reported that supplementing goat diets with 5% crude glycerin increased milk fat via fermentation of crude glycerin into propionic acid, and increased daily intake and digestibility of lipids. Meanwhile, vaccenic (t11–18:1) contents in milk fat were also enhanced with dietary interventions such as pistachio hulls [22], pomegranate seed pulp [22], tomato pomace [22], and fish oil [34].

Relations between rumen microbiota, body performance, and dietary intervention

Body performance can be improved by modulating the body system, increasing the feed intake, increasing or alleviating ruminal acidosis, improving digestibility, VFA profiles, and metabolites (Table 1). Body performance can be improved by improving animal energy balance through supplements and/or replacement of plant-based by-product, tomato silage with dietary lipids, sunflower oil [31], essential oil-cobalt [8], exogenous fibrolytic enzyme [36], and dietary cations and anions [37]. By partially replacing conventional forage with tomato silage plus sunflower oil [31], the body performance of dairy goats during mid-lactation was improved by increasing their body weight gain without compromising milk production and composition. Diets with a high non-fiber carbohydrate to neutral detergent fiber ratio and exogenous fibrolytic enzyme improved growth performance in Lezhi black goats by improving the average daily gain, feed conversion ratio, and nutrient utilization [36]. This could be due to increased microbial protein supply to the small intestine.
High-throughput sequencing and advanced techniques have been used to compare the effect of breed on the rumen microbiome and its associations with feed efficiency. In beef cattle, 8 bacterial phyla, including Bacteroidetes and Spirochaetes, and 55 taxa at the genus level such as Prevotella and Treponema were affected by breed [38]. Meanwhile, Shabat et al [39] and Wang et al [40] reported that the rumen bacterial and archaeal communities in alpha-diversity indices contributed to the variation in feed efficiency of cattle, wherein more complex and diverse microbial communities occurred in inefficient animals. Shabat et al [39] added that higher efficiency was tightly linked to lower richness of rumen microbiome gene content and taxa. Using metagenomic and metatranscriptomic analyses, Chloroflexi, Blautia, and a Mogibacteriaceae-affiliated unnamed genus were reported to be associated with feed efficiency in beef cattle rumen microbiome [38]. Chloroflexi was identified as related to host phenotype milk yield and diet adaptation, while Blautia was reported to provide energy to hosts from the fermentation of polysaccharides. Furthermore, efficient cows had a higher number of total short-chain fatty acid (10% higher) concentrations of propionate, butyrate, valerate, and isovalerate, and propionate to acetate than inefficient cows [39].
Dietary interventions that increase feed intake are Moringa oleifera [6,24], flaxseed oil [5], and exogenous fibrolytic enzyme (cellulase) [28], while Andrographis paniculata [41,42] and cereal grains treated with citric acid [43] are used to increase pH and alleviate ruminal acidosis. Cereal grains treated with organic acids increased ruminal resistant starch and relieved the risk of ruminal acidosis as well as reducing the inflammatory response [43]. In addition, fungal (Lentinus sajor-caju)-treated oil palm fronds [44], spent mushroom (Cordyceps militaris) [45], Moringa oleifera [6,24], lemongrass [23], rosemary [23], flaxseed oil [5], exogenous fibrolytic enzyme (cellulase) [28], and exogenous fibrolytic enzyme [36] were used to improve digestion in goats.
Anaerobic microbes in the rumen produce enzymes which the ruminants themselves can not. However, these enzymes are not enough to degrade most of the complex plant polysaccharides. Hence, exogenous fibrolytic enzyme supplements increase cellulase and xylanase activities, which increase fiber degradation. The exogenous fibrolytic enzyme helps in removing the structural barriers in feeds during digestion and thus improves the digestibility that allows cellulolytic bacteria to out-compete fungi for colonization in plant fibers. In addition, the improvement was due to improved energy substance metabolism, which also contributed to glycogenesis [34].
Meanwhile, the VFAs increased with a combination of essential oil and cobalt [8], fungal (Lentinus sajor-caju)-treated oil palm fronds [44], Andrographis paniculata [41,42], fumaric acid [19], and exogenous fibrolytic enzymes [36], while spent mushroom (Cordyceps militaris) was used to improve blood metabolites [45]. Moreover, Andrographis paniculata [41,42], and organic selenium [33] improved goat meat quality. Essential oils are plant-derived volatile aromatic compounds that have antibacterial, antiviral, antifungal, anti-nematode, insecticidal, and antioxidant properties. Cobalt is a co-factor of vitamin B12 that activates various enzymes. Supplements of combined essential oil and cobalt were reported to improve VFA production, which was positively associated with Bacteroides sp. and Succinivibrio sp. abundance [8]. In addition, a higher capacity for nitrogen utilization, xenobiotic biodegradation, and metabolism was observed in microbiota supplemented with a combination of essential oil and cobalt.
In tropical countries, heat accumulation and prolonged high ambient temperature affect animal performance and milk production due to reduced feed intake. When feed intake decreases, the intake of mineral elements also decreases. Hence, increasing dietary cation-anion difference (DCAD) is a necessity. Nguyen et al [37] reported that animals supplemented with high DCAD increased their total body water and apparent water balance through evaporative cooling, which slowed down the elevation in rectal temperature [37].


Ruminal microbiota play a pivotal role in animal nutrient utilization and synthesis for production and productivity. However, in the rumen, both synergistic and antagonistic interactions occur among microbes. These are essential in breaking down feed to produce VFAs that are then used by the animal as a source of energy. Probiotics are live microbes that stimulate beneficial microbes in the rumen while prebiotics are non-digestible sugars that provide substrates for beneficial microbes that induce their growth and activity. Probiotics and prebiotics are now widely used in livestock farming to benefit production and development, and address major public health concerns over antibiotic, antimicrobial, and hormonal growth promotors.
Probiotics have been shown to promote growth and health through increasing body weight gain, feed intake, and reducing diarrhea. Probiotic products may contain one or more selected strains, which are often gram-positive bacteria. The widely- used probiotics for ruminants are Bacillus, Bifidobacterium, Enterococcus, Lactobacillus, Pediococcus, Streptococcus, yeasts (Saccharomyces cerevisiae, Kluyveromyces sp.), and anaerobic fungus (Aspergillus oryzae). Aside from these widely known probiotics, there is continued research for new microbes that stimulate potentially beneficial rumen microbes. These are the cellulolytic bacteria, such as Cellulomonas cellulase, Bacillus sp., Thermomonospora fusca, Acetobacter xylinum, Ruminococcus albus, and Clostridium cellulovorans and fibrolysozyme or fibrolytic enzyme (fibrozyme), which is compounded from Aspergillus niger, Trichoderma longibrachiatum, fermentation extracts, and fermentation soluble [46].
In addition, important microbes involved in the pathway of rumen metabolism are also being explored. These are the fumarate reducing bacteria (Mitsuokella jalaludinii [47,48] and Enterococcus faecium [49], ruminal acetogens, Acetitomaculum ruminis, Eubacterium limosum strains ATCC 10825 and ATCC 8486, Ruminococcus productus ATCC 35244 [50], Ruminococcus schinkii sp. nov. [51], and Proteiniphilum acetatigenes [22]), the propionate-producing bacteria (Coprococcus catus [14], Lactobacillus mucosae [52,53], Megasphaera elsdenii [54], Propionibacterium acidipropionici [55], Prevotella ruminicola [56], Selenomonas ruminantium [57], and Veillonella parvula [58]), and the butyrate-producing bacteria (Butyrivibrio fibrisolvens [59]).
Fungi are one of the important microorganisms that have been used in farming owing to their multiple functions and beneficial effects. Aspergillus oryzae and Saccharomyces cerevisiae are some of the commercially available products. The function of probiotics exerts several effects, one of which is immunostimulation. The immunostimulant molecules in probiotic yeasts are β-glucans, chitins, mannans, and polyamines [60]. Saccharomyces cerevisiae is one of the well-known probiotics that produces vitamin B, organic acids, and amino acids [61]. The use of Saccharomyces cerevisiae as a ruminant feed additive could help the rumen bacteria to compete, or at least co-metabolize H2 with methanogens [62]. Moreover, Saccharomyces cerevisiae scavenges oxygen, which creates a more anaerobic environment in the rumen that enhances the hydrogenotrophic metabolism of the acetogenic strain by more than fivefold. This stimulates the utilization of hydrogen by the acetogenic strain and enhances acetogenesis [62]. In addition, supplements of yeast alleviate heat stress by reducing the absorption of endotoxins that effectively strengthen the antioxidant capacity of dairy goats [63]. Furthermore, the live Debaryomyces hansenii CBS 8339, a probiotic that is commonly found in marine environments, stimulates innate immune and antioxidant parameters and the expression of immune-related gene signaling pathways [60].
Prebiotics modulate the balance and activities of the rumen microbiota. Prebiotics contain specific nondigestible nutrients, which can be consumed raw or as functional foods and pharmaceutical preparations. Prebiotics include fructooligosaccharides, galactosyl-lactose, mannan oligosaccharides, pectin oligosaccharides, and xylooligosaccharides (Table 2).


High-throughput technologies such as “omics” technologies combined with recent dietary interventions have provided a deeper insight into the relations and interactions between the rumen microbiome, metabolites, genes, and host health, performance, and efficiency. Further research to improve and understand the functions and interactions among the hosts, microbiome, and the feed is required.


This work was supported by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through Advanced Production Technology Development Program, funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA) (317016-03-3-WT011).



We certify that there is no conflict of interest with any financial organization regarding the material discussed in the manuscript.

Figure 1
Recent dietary interventions in dairy goats.
Table 1
List of recent dietary interventions and their main effects on dairy goats
Main effects on dairy goats Dietary interventions References
Body performance
 Improved body performance Dietary cation and anion difference, exogenous fibrolytic enzyme, tomato silage plus sunflower oil [1012]
 Increased feed intake Exogenous fibrolytic enzyme (cellulase), flaxseed oil, Moringa oleifera [1619]
 Increased pH/alleviate ruminal acidosis Andrographis paniculata, cereal grains treated with citric acid [2022]
 Improved digestibility Exogenous fibrolytic enzyme (cellulase), exogenous fibrolytic enzyme, flaxseed oil, fungal (Lentinus sajor-caju) treated oil palm fronds, Lemongrass, Moringa oleifera, rosemary, spent mushroom (Cordyceps militaris) [11,1619,2325]
 Improved volatile fatty acid profiles Fungal (Lentinus sajor-caju) treated oil palm fronds, Andrographis paniculata, Fumaric acid [9,20,21,23]
 Improved blood metabolites Spent mushroom (Cordyceps militaris) [24]
 Increased milk production Exogenous fibrolytic enzyme (cellulase), flaxseed oil, humic acid, lemongrass, Moringa oleifera, rosemary, Ziziphus mauritiana, Sunflower seed, Sunflower seeds oil [1619,25,2830]
 Improve milk quality Exogenous fibrolytic enzyme (cellulase), humic acid, olive oil by-products plus sunflower oil, organic selenium, purple corn stover, tomato silage plus sunflower oil [10,19,27,30,31]
 High milk fat content Cottonseed cake, Grewia oppositifolia, lemongrass, rosemary, sunflower seed, sunflower seeds oil [25,28,29]
 Enhanced Conjugated linoleic acid in milk fat Canola oil, flaxseed oil, lemongrass, Moringa oleifera, pistachio hulls, pomegranate seed pulp, rosemary, tomato pomace, soybean, sunflower seed, sunflower seeds oil [1618,25,29,33,34]
 Enhanced Vaccenic (t11–18:1) contents in milk fat Fish oil, pistachio hulls, pomegranate seed pulp, tomato pomace [26,33]
 Increased total unsaturated fatty acids Flaxseed oil, hydrolysable tannins, lemongrass, rapeseed oil, rosemary, sunflower seed, sunflower seeds oil [18,25,29,32]
 Methane mitigation Fumaric acid, tannin [9,55]
 Improved meat Andrographis paniculata, organic selenium [20,21,27]
Table 2
List of prebiotics and their functions
Prebiotics Composition Function Reference
Cellooligosaccharide Glucose with beta-1–4 linkages Modulate the intestinal bacterial community of calves [56]
Fructooligosaccharides Spray-dried bovine serum Reduced the incidence and severity of enteric disease; growth performance [57,58]
Galactosyl lactose Trisaccharide (galactose plus lactose); enzymatic treatment of whey with beta-galactosidase Milk replacer; growth performance [58,59]
Mannan oligosaccharides Complex mannose sugars Block colonization of pathogens in the digestive tract; growth performance [58]
Pectin oligosaccharides Pectins (depolymerization of suitable raw materials or purified pectins by partial enzymatic hydrolysis) Protection of colonic cells against Shiga toxins, Prevention of the adhesion of uropathogenic microorganisms [60]
Xylooligosaccharides Lignocellulosic biomass (enzymatic or chemical process from xylan) Stimulation of beneficial gut microflora, reduction of blood glucose and cholesterol, reduced pro-carcinogenic enzymes in gastrointestinal tract, enhanced mineral absorption from large intestine and immune-stimulation. [61]


1. Cremonesi P, Conte G, Severgnini M, et al. Evaluation of the effects of different diets on microbiome diversity and fatty acid composition of rumen liquor in dairy goat. Animal 2018; 12:1856–66. https://doi.org/10.1017/S1751731117003433
crossref pmid
2. Dziuk HE, Mccauley EH. Comparison of ruminoreticular motility patterns in cattle, sheep, and goats. Am J Physiol 1965; 209:324–8. https://doi.org/10.1152/ajplegacy.1965.209.2.324
crossref pmid
3. Lee HJ, Jung JY, Oh YK, Lee SS, Madsen EL, Jeon CO. Comparative survey of rumen microbial communities and metabolites across one caprine and three bovine groups, using bar-coded pyrosequencing and 1H nuclear magnetic resonance spectroscopy. Appl Environ Microbiol 2012; 78:5983–93. http://dx.doi.org/10.1128/AEM.00104-12
crossref pmid pmc
4. Lee M, Jeong S, Seo J, Seo S. Changes in the ruminal fermentation and bacterial community structure by a sudden change to a high-concentrate diet in Korean domestic ruminants. Asian-Australas J Anim Sci 2019; 32:92–102. https://doi.org/10.5713/ajas.18.0262
crossref pmid pdf
5. Kholif AE, Morsy TA, Abdo MM. Crushed flaxseed versus flaxseed oil in the diets of Nubian goats: Effect on feed intake, digestion, ruminal fermentation, blood chemistry, milk production, milk composition and milk fatty acid profile. Anim Feed Sci Technol 2018; 244:66–75. https://doi.org/10.1016/j.anifeedsci.2018.08.003
6. Kholif AE, Gouda GA, Anele UY, Galyean ML. Extract of Moringa oleifera leaves improves feed utilization of lactating Nubian goats. Small Rumin Res 2018; 158:69–75. https://doi.org/10.1016/j.smallrumres.2017.10.014
7. Canaes TS, Zanferari F, Maganhe BL, et al. Increasing dietary levels of citral oil on nutrient total tract digestibility, ruminal fermentation, and milk composition in Saanen goats. Anim Feed Sci Technol 2017; 229:47–56. https://doi.org/10.1016/j.anifeedsci.2017.05.002
8. Lei Z, Zhang K, Li C, et al. Ruminal metagenomic analyses of goat data reveals potential functional microbiota by supplementation with essential oil-cobalt complexes. BMC Microbiol 2019; 19:30https://doi.org/10.1186/s12866-019-1400-3
crossref pmid pmc pdf
9. Wang L, Xu Q, Kong F, et al. Exploring the goat rumen microbiome from seven days to two years. PLoS One 2016; 11:5e0154354https://doi.org/10.1371/journal.pone.0154354
crossref pmid pmc
10. Cunha IS, Barreto CC, Costa OYA, et al. Bacteria and Archaea community structure in the rumen microbiome of goats (Capra hircus) from the semiarid region of Brazil. Anaerobe 2011; 17:118–24. https://doi.org/10.1016/j.anaerobe.2011.04.018
crossref pmid
11. Henderson G, Cox F, Ganesh S, et al. Rumen microbial community composition varies with diet and host, but a core microbiome is found across a wide geographical range. Sci Rep 2015; 5:14567https://doi.org/10.1038/srep14567
crossref pmid pmc
12. Lei Y, Zhang K, Guo M, et al. Exploring the spatial-temporal microbiota of compound stomachs in a pre-weaned goat model. Front Microbiol 2018; 9:1846https://doi.org/10.3389/fmicb.2018.01846
crossref pmid pmc
13. Lerma-Reyes I, Mendoza-Martínez GD, Rojo-Rubio R, Mejia M, García-Lopez JC, Lee-Rangel HA. Influence of supplemental canola or soybean oil on milk yield, fatty acid profile and postpartum weight changes in grazing dairy goats. Asian-Australas J Anim Sci 2018; 31:225–9. https://doi.org/10.5713/ajas.17.0058
crossref pmid pdf
14. Dewanckele L, Vlaeminck B, Hernandez-Sanabria E, et al. Rumen biohydrogenation and microbial community changes upon early life supplementation of 22:6n−3 enriched microalgae to goats. Front Microbiol 2018; 9:573https://doi.org/10.3389/fmicb.2018.00573
crossref pmid pmc
15. Hook SE, Wright A-DG, McBride BW. Methanogens: methane producers of the rumen and mitigation strategies. Archaea. 2010. 2010:Article ID 945785. http://dx.doi.org/10.1155/2010/945785
crossref pdf
16. Pragna P, Chauhan SS, Sejian V, Leury BJ, Dunshea FR. Climate change and goat production: Enteric methane emission and its mitigation. Animals 2018; 8:235https://doi.org/10.3390/ani8120235
17. Na Y, Li DH, Choi Y, Kim KH, Lee SR. Effects of feeding level on nutrient digestibility and enteric methane production in growing goats (Capra hircus hircus) and Sika deer (Cervus nippon hortulorum). Asian-Australas J Anim Sci 2018; 31:1238–43. https://doi.org/10.5713/ajas.17.0708
crossref pmid pmc pdf
18. Zhou M, Hernandez-Sanabria E, Le LG. Assessment of the microbial ecology of ruminal methanogens in cattle with different feed efficiencies. Appl Environ Microbiol 2009; 75:6524–33. https://doi.org/10.1128/AEM.02815-08
crossref pmid pmc
19. Payraudeau S, van der Werf HMG. Environmental impact assessment for a farming region: a review of methods. Agric Ecosyst Environ 2005; 107:1–19. https://doi:10.1016/j.agee.2004.12.012
20. Mitsumori M, Shinkai T, Takenaka A, et al. Responses in digestion, rumen fermentation and microbial populations to inhibition of methane formation by a halogenated methane analogue. Br J Nutr 2012; 108:482–91. https://doi.org/10.1017/S0007114511005794
crossref pmid
21. Denman SE, Fernandez GM, Shinkai T, Mitsumori M, McSweeney CS. Metagenomic analysis of the rumen microbial community following inhibition of methane formation by a halogenated methane analog. Front Microbiol 2015; 6:1087https://doi.org/10.3389/fmicb.2015.01087
crossref pmid pmc
22. Kim SH, Mamuad LL, Choi YJ, Sung HG, Cho KK, Lee SS. Effects of reductive acetogenic bacteria and lauric acid on in vivo ruminal fermentation, microbial populations, and methane mitigation in Hanwoo steers in South Korea. J Anim Sci 2018; 96:4360–7. https://doi.org/10.1093/jas/sky266
crossref pmid pdf
23. Kholif AE, Matloup OH, Morsy TA, et al. Rosemary and lemongrass herbs as phytogenic feed additives to improve efficient feed utilization, manipulate rumen fermentation and elevate milk production of Damascus goats. Livest Sci 2017; 204:39–46. https://doi.org/10.1016/j.livsci.2017.08.001
24. Kholif AE, Morsy TA, Gouda GA, Anele UY, Galyean ML. Effect of feeding diets with processed Moringa oleifera meal as protein source in lactating Anglo-Nubian goats. Anim Feed Sci Technol 2016; 217:45–55. https://doi.org/10.1016/j.anifeedsci.2016.04.012
25. Morsy TA, Kholif SM, Kholif AE, Matloup OH, Salem AZM, Elella AA. Influence of sunflower whole seeds or oil on ruminal fermentation, milk production, composition, and fatty acid profile in lactating goats. Asian-Australas J Anim Sci 2015; 28:1116–22. https://doi.org/10.5713/ajas.14.0850
crossref pmid pmc pdf
26. Buccioni A, Pauselli M, Viti C, et al. Milk fatty acid composition, rumen microbial population, and animal performances in response to diets rich in linoleic acid supplemented with chestnut or quebracho tannins in dairy ewes. J Dairy Sci 2015; 98:1145–56. https://doi.org/10.3168/jds.2014-8651
crossref pmid
27. Thoh D, Pakdeechanuan P, Chanjula P. Effect of supplementary glycerin on milk composition and heat stability in dairy goats. Asian-Australas J Anim Sci 2017; 30:1711–7. https://doi.org/10.5713/ajas.17.0066
crossref pmid pmc pdf
28. Rojo R, Kholif AE, Salem AZM, et al. Influence of cellulase addition to dairy goat diets on digestion and fermentation, milk production and fatty acid content. J Agric Sci 2015; 153:1514–23. https://doi.org/10.1017/S0021859615000775
29. El-Zaiat HM, Morsy AS, El-Wakeel EA, Anwer MM, Sallam SM. Impact of humic acid as an organic additive on ruminal fermentation constituents, blood parameters and milk production in goats and their kids growth rate. J Anim Feed Sci 2018; 27:105–13. https://doi.org/10.22358/jafs/92074/2018
crossref pdf
30. Khan NA, Habib G, Ullah G. Chemical composition, rumen degradability, protein utilization and lactation response to selected tree leaves as substitute of cottonseed cake in the diet of dairy goats. Anim Feed Sci Technol 2009; 154:160–8. https://doi.org/10.1016/j.anifeedsci.2009.08.011
31. Arco-Pérez A, Ramos-Morales E, Yáñez-Ruiz DR, Abecia L, Martín-García AI. Nutritive evaluation and milk quality of including of tomato or olive by-products silages with sunflower oil in the diet of dairy goats. Anim Feed Sci Technol 2017; 232:57–70. https://doi.org/10.1016/j.anifeedsci.2017.08.008
32. Tian XZ, Paengkoum P, Paengkoum S, Chumpawadee S, Ban C, Thongpea S. Short communication: Purple corn (Zea mays L.) stover silage with abundant anthocyanins transferring anthocyanin composition to the milk and increasing antioxidant status of lactating dairy goats. J Dairy Sci 2018; 102:413–8. https://doi.org/10.3168/jds.2018-15423
crossref pmid
33. Zhang L, Liu XR, Liu JZ, et al. Supplemented organic and inorganic selenium affects milk performance and selenium concentration in milk and tissues in the Guanzhong dairy goat. Biol Trace Elem Res 2018; 183:254–60. https://doi.org/10.1007/s12011-017-1112-1
crossref pmid pdf
34. Toral PG, Rouel J, Bernard L, Chilliard Y. Interaction between fish oil and plant oils or starchy concentrates in the diet: Effects on dairy performance and milk fatty acid composition in goats. Anim Feed Sci Technol 2014; 198:67–82. https://doi.org/10.1016/j.anifeedsci.2014.09.019
35. Abo-Donia FM, Yang LY, Hristov AN, et al. Effects of tannins on the fatty acid profiles of rumen fluids and milk from lactating goats fed a total mixed ration containing rapeseed oil. Livest Sci 2017; 204:16–24. https://doi.org/10.1016/j.livsci.2017.08.002
36. Song SD, Chen GJ, Guo CH, et al. Effects of exogenous fibrolytic enzyme supplementation to diets with different NFC/NDF ratios on the growth performance, nutrient digestibility and ruminal fermentation in Chinese domesticated black goats. Anim Feed Sci Technol 2018; 236:170–7. https://doi.org/10.1016/j.anifeedsci.2017.12.008
37. Nguyen T, Chaiyabutr N, Chanpongsang S, Thammacharoen S. Dietary cation and anion difference: Effects on milk production and body fluid distribution in lactating dairy goats under tropical conditions. Anim Sci J 2018; 89:105–13. https://doi.org/10.1111/asj.12897
crossref pmid
38. Li F, Hitch TCA, Chen Y, Creevey CJ, Guan LL. Comparative metagenomic and metatranscriptomic analyses reveal the breed effect on the rumen microbiome and its associations with feed efficiency in beef cattle. Microbiome 2019; 7:6https://doi.org/10.1186/s40168-019-0618-5
crossref pmid pmc pdf
39. Shabat SKB, Sasson G, Doron-Faigenboim A, et al. Specific microbiome-dependent mechanisms underlie the energy harvest efficiency of ruminants. ISME J 2016; 10:2958–72. https://doi.org/10.1038/ismej.2016.62
crossref pmid pmc pdf
40. Wang J, Wang JQ, Zhou H, Feng T. Effects of addition of previously fermented juice prepared from alfalfa on fermentation quality and protein degradation of alfalfa silage. Anim Feed Sci Technol 2009; 151:280–90. https://doi.org/10.1016/j.anifeedsci.2009.03.001
41. Yusuf AL, Adeyemi KD, Roselina K, et al. Dietary supplementation of different parts of Andrographis paniculata affects the fatty acids, lipid oxidation, microbiota, and quality attributes of longissimus muscle in goats. Food Res Int 2018; 111:699–707. https://doi.org/10.1016/j.foodres.2018.06.015
crossref pmid
42. Yusuf AL, Adeyemi KD, Samsudin AA, Goh YM, Alimon AR, Sazili AQ. Effects of dietary supplementation of leaves and whole plant of Andrographis paniculata on rumen fermentation, fatty acid composition and microbiota in goats. BMC Vet Res 2017; 13:349https://doi.org/10.1186/s12917-017-1223-0
crossref pmid pmc
43. Shen YZ, Ding LY, Chen LM, et al. Feeding corn grain steeped in citric acid modulates rumen fermentation and inflammatory responses in dairy goats. Animal 2018; 13:301–8. https://doi.org/10.1017/S1751731118001064
crossref pmid
44. Hamchara P, Chanjula P, Cherdthong A, Wanapat M. Digestibility, ruminal fermentation, and nitrogen balance with various feeding levels of oil palm fronds treated with Lentinus sajor-caju in goats. Asian-Australas J Anim Sci 2018; 31:1619–26. https://doi.org/10.5713/ajas.17.0926
crossref pmid pmc pdf
45. Chanjula P, Cherdthong A. Effects of spent mushroom Cordyceps militaris supplementation on apparent digestibility, rumen fermentation, and blood metabolite parameters of goats. J Anim Sci 2018; 96:1150–8. https://doi.org/10.1093/jas/skx079
crossref pmid pmc pdf
46. Abou Elenin EIM, Abd El-Galil ER, Etman KEI, El-Shabrawy HM. Improvement of rumen fermentation and performance of growing lambs by adding natural microbial resources. Asian J Anim Sci 2016; 10:202–12. https://doi.org/10.3923/ajas.2016.202.212
47. Mamuad LL, Kim SH, Lee SS, Cho KK, Jeon CO, Lee SS. Characterization, metabolites and gas formation of fumarate reducing bacteria isolated from Korean native goat (Capra hircus coreanae). J Microbiol 2012; 50:925–31. https://doi.org/10.1007/s12275-012-2497-3
crossref pmid pdf
48. Mamuad L, Kim SH, Jeong CD, Choi YJ, Jeon CO, Lee S-S. Effect of fumarate reducing bacteria on in vitro rumen fermentation, methane mitigation and microbial diversity. J Microbiol 2014; 52:120–8. https://doi.org/10.1007/s12275-014-3518-1
crossref pmid pdf
49. Kim S-H, Mamuad LL, Kim D-W, Kim S-K, Lee S-S. Fumarate reductase-producing enterococci reduce methane production in rumen fermentation in vitro . J Microbiol Biotechnol 2016; 26:558–66. https://doi.org/10.4014/jmb.1512.12008
crossref pmid pdf
50. Lopez S, McIntosh FM, Wallace RJ, Newbold CJ. Effect of adding acetogenic bacteria on methane production by mixed rumen microorganisms. Anim Feed Sci Technol 1999; 78:1–9. https://doi.org/10.1016/S0377-8401(98)00273-9
51. Rieu-Lesme F, Morvan B, Collins MD, Fonty G, Willems A. A new H2/CO2-using acetogenic bacterium from the rumen: description of Ruminococcus schinkii sp. nov. FEMS Microbiol Lett 1996; 140:281–6. https://doi.org/10.1111/j.1574-6968.1996.tb08350.x
52. Mamuad LL, Kim SH, Choi YJ, et al. Increased propionate concentration in Lactobacillus mucosae–fermented wet brewers grains and during in vitro rumen fermentation. J Appl Microbiol 2017; 123:29–40. https://doi.org/10.1111/jam.13475
crossref pmid
53. Soriano AP, Mamuad LL, Kim S-H, et al. Effect of Lactobacillus mucosae on in vitro rumen fermentation characteristics of dried brewers grain, methane production and bacterial diversity. Asian-Australas J Anim Sci 2014; 27:1562–70. https://doi.org/10.5713/ajas.2014.14517
crossref pmid pmc pdf
54. Hino T, Shimada K, Maruyama T. Substrate preference in a strain of Megasphaera elsdenii, a ruminal bacterium, and its implications in propionate production and growth competition. Appl Environ Microbiol 1994; 60:1827–31.
55. Zhu Y, Li J, Tan M, et al. Optimization and scale-up of propionic acid production by propionic acid-tolerant Propionibacterium acidipropionici with glycerol as the carbon source. Bioresour Technol 2010; 101:8902–6. https://doi.org/10.1016/j.biortech.2010.06.070
crossref pmid
56. Strobel HJ. Vitamin B12-dependent propionate production by the ruminal bacterium Prevotella ruminicola 23. Appl Environ Microbiol 1992; 58:2331–3.
57. Scheifinger CC, Wolin MJ. Propionate formation from cellulose and soluble sugars by combined cultures of Bacteroides succinogenes and Selenomonas ruminantium . Appl Microbiol 1973; 26:789–95.
58. Janssen PH. Growth yield increase and ATP formation linked to succinate decarboxylation in Veillonella parvula . Arch Microbiol 1992; 157:442–5. https://doi.org/10.1007/BF00249102
crossref pmid pdf
59. Diez-Gonzalez F, Bond DR, Jennings E, Russell JB. Alternative schemes of butyrate production in Butyrivibrio fibrisolvens and their relationship to acetate utilization, lactate production, and phylogeny. Arch Microbiol 1999; 171:324–30.
crossref pmid pdf
60. Angulo M, Reyes-Becerril M, Cepeda-Palacios R, Tovar-Ramírez D, Esteban MÁ, Angulo C. Probiotic effects of marine Debaryomyces hansenii CBS 8339 on innate immune and antioxidant parameters in newborn goats. Appl Microbiol Biotechnol 2019; 103:2339–52. https://doi.org/10.1007/s00253-019-09621-5
crossref pmid pdf
61. Callaway ES, Martin SA. Effects of a Saccharomyces cerevisiae culture on ruminal bacteria that utilize lactate and digest cellulose. J Dairy Sci 1997; 80:2035–44.
crossref pmid
62. Chaucheyras F, Fonty G, Bertin G, Gouet P. In vitro H2 utilization by a ruminal acetogenic bacterium cultivated alone or in association with an archaea methanogen is stimulated by a probiotic strain of Saccharomyces cerevisiae. Appl Environ Microbiol 1995; 61:3466–7.
pmid pmc
63. Wang L, Wang Z, Zou H, Peng Q. Yeast culture and Vitamin E supplementation alleviates heat stress in dairy goats. Asian-Australas J Anim Sci 2016; 29:814–22. https://doi.org/10.5713/ajas.15.0414
crossref pmid pdf

Editorial Office
Asian-Australasian Association of Animal Production Societies(AAAP)
Room 708 Sammo Sporex, 23, Sillim-ro 59-gil, Gwanak-gu, Seoul
08776, Korea   TEL : +82-2-888-6558    FAX : +82-2-888-6559   
E-mail : jongkha@hotmail.com               

Copyright © 2019 by Asian-Australasian Journal of Animal Sciences. All rights reserved.

Developed in M2community

Close layer
prev next