Molecular Nutrition

Effects of Essential Amino Acids Partial Deduction in Starter on Slaughter Performance and Amino Acid Contents in Different Parts of Hu Lambs

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  • 1. Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    2. College of Animal Science, Tarim University, Alar 843300, China

Received date: 2017-06-02

  Online published: 2018-01-04

Abstract

This experiment was conducted to research the effects of essential amino acids[lysine (Lys), methionine (Met), threonine (Thr) and tryptophan (Trp)] partial deduction in starter on slaughter performance and amino acid contents in different parts of Hu lambs. One hundred Hu lambs weaned at 50 days of age were randomly divided into five groups and each group had four replicates with five lambs per replicate. Control group was fed a starter with balanced amino acid (PC group), while 4 experimental groups were fed the starter deducting 30% Lys, Met, Thr and Trp based on control group, respectively, which were recorded as PD-Lys, PD-Met, PD-Thr and PD-Trp groups, respectively. The pretest lasted for 11 days, and the formal trial period lasted for 60 days. Six lambs selected from each group were slaughtered at 120 days of age. The results showed as follows:1) empty body weight, skin and wool peel weight, carcass weight and feet weight in PD-Lys and PD-Met groups were significantly lower than those in PC group (P<0.05). 2) Carcass crude protein content in PD-Met group was significantly lower than that in PC and PD-Trp groups (P<0.05), wool ether extract content in PC, PD-Lys and PD-Met groups was significantly lower than that in PD-Thr and PD-Trp groups (P<0.05), PC group has the lowest carcass ether extract content compared with the other groups (P<0.05), and moisture of head and feet in PD-Met group was significantly lower than that in PC and PD-Lys groups (P<0.05). 3) Essential amino acids and non-essential amino acids contents in head and feet, skin and wool, as while as carcass essential amino acids content in PD-Met group were significantly higher than those in PC group (P<0.05). In conclusion, the ideal essential amino acid models of Lys, Met, Thr and Trp of weaned Hu lambs from 60 to 120 days of age are as follows:carcass, 100:21:129:11; skin and wool, 100:34:70:7; and head and feet, 100:35:44:13.

Cite this article

LI Xueling, ZHANG Naifeng, MA Tao, TAO Dayong, CHAI Jianmin, WANG Yurong, ZHANG Fan, DIAO Qiyu . Effects of Essential Amino Acids Partial Deduction in Starter on Slaughter Performance and Amino Acid Contents in Different Parts of Hu Lambs[J]. Chinese Journal of Animal Nutrition, 2018 , 30(1) : 115 -125 . DOI: 10.3969/j.issn.1006-267x.2018.01.016

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