›› 2016, Vol. 43 ›› Issue (8): 2005-2012.doi: 10.16431/j.cnki.1671-7236.2016.08.011

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Effects of Energy Level on Physical and Chemical Indicators,Composition and Content of Amino Acids and Fatty Acids in Muscle of House-fed Yaks

WANG Bin-xing1, WANG Ding1, GUO Chun-hua1, CHEN Guang-ji1, PENG Zhong-li1, WANG Yong1,2, JIAN Shang-lin3   

  1. 1. College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610041, China;
    2. Key Laboratory of Animal Genetics and Breeding, State Ethnic Affairs Commission and Ministry of Education, Southwest University for Nationalities, Chengdu 610041, China;
    3. Aba Livestock Workstation, Sichuan Province, Maerkang 624000, China
  • Revised:2016-04-21 Online:2016-08-20 Published:2016-08-23

Abstract:

This experiment was conducted to investigate the effects of energy level on the physical and chemical indicators,the composition and content of amino acids and fatty acids in muscle of house-fed yaks.A complete randomized design was adopted in this study,and sixty healthy and 3-year-old Maiwa yaks with an average body weight of (192.66±3.64)kg were randomly divided into 3 groups with 20 replicates per group and 1 yak per replicate.Diets for all groups were of the same crude protein content (14.81%) and different net energy levels for gain (NEg) with 4.17(LE),4.48(ME) and 4.79 MJ/kg (HE),respectively for 97 days (7-day pretrial period,and 90-day feeding trial).The results showed as follows:The level of energy had no effect on the value of pH,cooking yield,drip loss,moisture,crude protein (CP),crude fat (EE),calcium (Ca) and phosphorus (P) (P>0.05).Except for the content of proline and histidine in muscle of group ME were significantly higher than the other groups (P<0.05),the content of total amino acids and other kinds of amino acids had no significant difference (P>0.05).The content of monounsaturated fatty acids,polyunsaturated fatty acids and total unsaturated fatty acids in ME group were significantly higher than the LE and HE groups,and the content of total saturated fatty acids in HE group higher than the LE and ME groups.For all kinds of fatty acid,the content of C15:1 n-3,C16:1 n-2 and C18:1 n-8 three monounsaturated fatty acids in ME group significantly increased than the other two groups (P<0.05);And the content of C17:0 in HE group had a significat rise trend.In conclusion,we recommend 4.48 MJ/kg (DM basis) as a diet appropriate NEg level for the barn feeding of fattening yak under this experimental condition,appropriate NEg level of diet could improve the fatty acids content in muscle of the yaks.

Key words: house-fed yak; energy level; physical and chemical indicators; amino acids; fatty acids

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