Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (22): 4678-4686.doi: 10.3864/j.issn.0578-1752.2011.22.015

• ANIMAL SCIENCE·RESOURCE INSECT • Previous Articles     Next Articles

Effect of Nitrogen Levels of Diets on Ruminal Fermentation Characters and Nitrogen Fractions in Yak

 MI  Jian-Dui, GUO  Xu-Sheng, ZHOU  Jian-Wei, XIN  Guo-Sheng, ZHANG  Ying, ZHU  Yu-Huan, LONG  Rui-Jun   

  1. 1..兰州大学草地农业科技学院，兰州730000
    2..兰州大学干旱与草地生态教育部重点实验室，兰州730000
    3..兰州大学青藏高原草地生态管理国际中心，兰州730000
  • Received:2010-10-31 Online:2011-11-15 Published:2011-03-15

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Abstract: 【Objective】 The objective of this study is to evaluate the effect of different N levels of diets on the ruminal fermentation and nitrogen fractions in yak. 【Method】 Four castrated yaks at (148.5±9.2) kg and 3-year-old of age were used in a partially replicated 4×4 Latin square with 4 different N levels of diets treatments (A(35.92 g•d-1), B(49.44 g•d-1), C(61.28 g•d-1), D (72.48 g•d-1)) and 4 20-day periods. pH, FAA-N (free amino acid nitrogen), NH3-N (NH3 nitrogen), PAA-N (peptide amino acid nitrogen), soluble protein N (nitrogen) and VFA (volatile fatty acid) were studied in different times before (07：30) and after feeding (10：00, 12：00, 14：00, 16：00) at last day. 【Result】 Ruminal pH was not affected by diets (P＞0.05). PAA-N, soluble protein N, FAA-N, total VFA and NH3-N were significantly differed among yaks with different diets (P＜0.05). NH3-N was also affected by diet×time interaction (P＜0.05). Acetate/propionate was not affected by different diets (P＞0.05). 【Conclusion】 Under the rations of the present study, when N of diet greater than 1.97%, most nitrogen fractions in yak do not response to the nitrogen level of the experimental diets. At 2.90% nitrogen of diet, acetate/propionate is the minimum and total VFA is the maximum.

Key words: yak, N level, rumen, N fraction

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