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Effects of Natural Grazing and Grazing with Supplementary Feeding on Amino Acid Composition of Plasma and Muscle of Mutton Sheep

  • ZHANG Ying ,
  • WU Tiemei ,
  • WANG Xue ,
  • Gerelmaa ,
  • SHI Binlin ,
  • GUO Xiaoyu ,
  • YAN Sumei
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  • College of Animal Sciences, Inner Mongolia Agricultural University, Hohhot 010018, China

Received date: 2016-01-06

  Online published: 2016-07-28

Abstract

This experiment was conducted to investigate the changes of amino acid (AA) composition of plasma and muscle tissues (longissimus, arm triceps and biceps femoris) of Hulunbeier lambs (HL) and the hybrid (HZ) between HL and Dorper sheep under two fattening modes of natural grazing (NG) and grazing with supplementary feeding (GS). The experiment adopted a 2×2 factorial arrangement. Sixty healthy weaned HL and sixty HZ with similar body weight and body condition were selected. Factor 1 was fattening modes (NG vs. GS), and factor 2 was species (HL vs. HZ). Lambs were divided into 4 groups of 30 animals each. The results showed as follows: 1) plasma contents of essential amino acid (EAA), limited AA (LAA), functional AA (FAA) and total AA (TAA) of NG group were significantly lower than those of GS group (P<0.05), delicious AA (DAA) content tended to be lower than of GS group (0.05 ≤ P < 0.10). 2) Compared with GS group, the contents of CP and LAA of longissimus of NG group were significantly higher (P<0.05). 3) Compared with GS group, the contents of LAA and DAA of arm triceps of NG group were significantly lower (P<0.05), EAA content of NG group tended to be lower (0.05 ≤ P < 0.10). 4) Compared with GS group, the contents of CP, EAA, non-essential AA (NEAA), TAA, LAA, branched-chain AA (BCAA) and DAA of biceps femoris of NG group were significantly lower (P<0.05). 5) Compared with HL group, plasma EAA, longissimus LAA, arm triceps BCAA and biceps femoris EAA contents were significantly (P<0.05) or tended to be significantly increased (P<0.10). It is concluded that muscle protein nutrition value of GS is better than NG, and protein nutrition value of HZ is better than HL.

Cite this article

ZHANG Ying , WU Tiemei , WANG Xue , Gerelmaa , SHI Binlin , GUO Xiaoyu , YAN Sumei . Effects of Natural Grazing and Grazing with Supplementary Feeding on Amino Acid Composition of Plasma and Muscle of Mutton Sheep[J]. Chinese Journal of Animal Nutrition, 2016 , 28(7) : 2162 -2175 . DOI: 10.3969/j.issn.1006-267x.2016.07.022

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