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http://dx.doi.org/10.5713/ajas.15.0419

Effects of Forage:Concentrate Ratio on Growth Performance, Ruminal Fermentation and Blood Metabolites in Housing-feeding Yaks  

Chen, G.J. (Southwest University for Nationalities, College of Life Science and Technology)
Song, S.D. (Southwest University for Nationalities, College of Life Science and Technology)
Wang, B.X. (Southwest University for Nationalities, College of Life Science and Technology)
Zhang, Z.F. (Southwest University for Nationalities, College of Life Science and Technology)
Peng, Z.L. (Southwest University for Nationalities, College of Life Science and Technology)
Guo, C.H. (Southwest University for Nationalities, College of Life Science and Technology)
Zhong, J.C. (Southwest University for Nationalities, College of Life Science and Technology)
Wang, Y. (Southwest University for Nationalities, College of Life Science and Technology)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.28, no.12, 2015 , pp. 1736-1741 More about this Journal
Abstract
The objective of this study was to determine the effect of forage: concentrate ratio (F:C) on growth performance, ruminal fermentation and blood metabolites of housing-feeding yaks. Thirty-two Maiwa male yaks (initial body weight = $207.99{\pm}3.31kg$) were randomly assigned to four dietary treatments (8 yaks per treatment). Experimental diets were: A, B, C, D which contained 70:30, 60:40, 50:50 and 40:60 F:C ratios, respectively. Dry matter intake and average daily gain in yaks fed the C and D diets were greater (p<0.05) than yaks fed the A and B diets. No differences were found in ruminal $NH_3-N$, total volatile fatty acids, acetate, butyrate, valerate, and isovalerate concentrations. The propionate concentration was increased (p<0.05) in the C and D groups compared with the A and B diets. In contrast, the acetate to propionate ratio was decreased and was lowest (p<0.05) in the C group relative to the A and B diets, but was similar with the D group. For blood metabolites, no differences were found in serum concentrations of urea-N, albumin, triglyceride, cholesterol, low density lipoprotein, alanine aminotransferase, and aspartate aminotransferase (p>0.05) among treatments. Treatment C had a higher concentration of total protein and high density lipoprotein (p<0.05) than A and B groups. In addition, there was a trend that the globulin concentration of A group was lower than other treatments (p = 0.079). Results from this study suggest that increasing the level of concentrate from 30% to 50% exerted a positive effect on growth performance, rumen fermentation and blood metabolites in yaks.
Keywords
Blood Metabolites; Forage:Concentrate Ratio; Growth Performance; Ruminal Fermentation; Yak;
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