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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0342    [Accepted] Published online August 3, 2019.
Dietary rambutan peel powder as a rumen modifier in beef cattle
Thiwakorn Ampapon1, Metha Wanapat1,* 
Tropical Feed Resources Research and Development Center (TROFREC), Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand
Correspondence:  Metha Wanapat, Tel: +66-81-9324180, Fax: +66-872700358, Email: metha@kku.ac.th
Received: 24 April 2019   • Revised: 3 June 2019   • Accepted: 6 July 2019
Abstract
Objective
The experiment was conducted to study the effect of rambutan (Nephelium lappaceum) fruit peel powder (RP) on DM feed consumption, digestibility of nutrients, ruminal fermentation dynamics and microbial population in Thai breed cattle.
Methods
Four, 2-year old (250±15 kg) beef bull crossbreds (75 % Brahman × 25 % local breed) were allotted to experimental treatments using a 4×4 Latin square design. Four dietary supplementation treatments were imposed; non-supplementation (control, T1); supplementation of RP fed at 2% of DMI (low, T2); supplementation of RP fed at 4% of DMI (medium, T3) and supplementation of RP fed at 6% of DMI (high, T4). All cattle were given a concentrate supplement at 1 % of body weight while Napier grass was provided as a free choice.
Results
The findings revealed that RP supplementation did not negatively affect (P>0.05) DM intake of Napier grass, while RP intake and total DMI were the greatest in the RP supplementation at 4 and 6%DMI. Nevertheless, the nutrients (DM, OM, CP, NDF and ADF) digestibilities were not changed in the RP supplementation groups. Rumen fermentation parameters especially those of total volatile fatty acids, acetate and butyrate were not significantly changed. However, the propionate concentration was remarkably increased (P<0.05) in the RP supplementation. Notably, the ratio of acetate to propionate, the number of protozoa, as well as the methane estimation were significantly reduced in the RP supplemented groups (4 and 6 % of DMI), while the counts of bacteria was not altered.
Conclusion
Supplementation of RP (4% of DMI) improved rumen propionate production, reduced protozoal population and methane estimation (P<0.05) without a negative effect on DM consumption and nutrients total tract digestibilities in beef cattle. Using dietary rambutan fruit peel powder has potential promise as a rumen regulator.
Keywords: Methane, Plant Secondary Compounds, Rambutan Peel Powder, Rumen Enhancer
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