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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.18.0409    [Accepted] Published online July 26, 2018.
Altering uNDF through additives applied in corn, whole barley crop, and alfalfa silages, and its effect on the yield and composition of milk in lactating Holstein dairy cows
Seyed Mohsen Hosseini1  , MOHSEN DANESH MESGARAN1,*  , Ali reza Vakili1, Abbas Ali Naserian1, Ehsan Khafipour2
2University of Manitoba, Winnipeg, Canada
Correspondence:  MOHSEN DANESH MESGARAN, Tel: +98-915-111-4019, Fax: +98-513-8802000, Email: danesh@um.ac.ir
Received: 23 April 2018   • Revised: 8 June 2018   • Accepted: 5 July 2018
We hypothesized that silage additives may alter the undigested NDF (uNDF) content through ensiling. Therefore, urea and formic acid applied to corn, whole barley crop (WBC) and alfalfa in order to change uNDF content of the ensiled forages.
Six experimental diets at two groups of high uNDF (untreated corn and alfalfa silages (CSAS) and untreated whole barley and alfalfa silages (BSAS)) and low uNDF (urea-treated corn silage + untreated alfalfa silage (CSUAS), urea-treated whole barley silage + untreated alfalfa silage (BSUAS), untreated corn silage + formic acid-treated alfalfa silage (CSASF) and untreated whole barley silage + formic acid-treated alfalfa silage (BSASF)), were allocated to thirty-six multiparous lactating Holstein dairy cows.
The untreated silages were high in uNDF than additive treated silages, but the uNDF concentrations among silages were variable (CS < BS < AS). Dry matter intake was not influenced by the reduction of uNDF or physical NDF supply source from corn to WBC silages (p > 0.05). Milk yield tended to increase in the cows fed high uNDF diets than those fed low uNDF (p = 0.10). The cows fed diet based on urea-treated corn silage had higher milk yield than those fed other silages (p = 0.05). The substitution of corn silage with the WBC silage tended to decrease milk production (p = 0.07). Changing the physical source of NDF supply and the uNDF content from the corn silage to the WBC silage caused a significant increase in ruminal NH3-N concentration, milk urea-N and fat yield (p < 0.05). The cows fed diets based on WBC silage experienced greater rumination time than the cows fed corn silage (p< 0.05).
The results of the present study clarify that administering additives to silages in order to reduce uNDF may improve the performance of Holstein dairy cows.
Keywords: Corn; WBC; Alfalfa; uNDF; Milk; Cow

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