Effects of Supplementation of Rumen Protected Amino Acids in Low Protein Diets on Growth Performance and Slaughter Performance of Dorper&times;Thin-Tailed Han Crossbred Mutton Sheep during Fattening Stage

GUO Wei; WANG Wenyi; YANG Dong; CUI Kai; ZHANG Juan; LIU Min; LI Dongmao; HU Xiuzhi; DIAO Qiyu

doi:10.3969/j.issn.1006-267x.2020.03.032

2020 , Vol. 32 >Issue 3: 1247 - 1255

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.03.032

Effects of Supplementation of Rumen Protected Amino Acids in Low Protein Diets on Growth Performance and Slaughter Performance of Dorper×Thin-Tailed Han Crossbred Mutton Sheep during Fattening Stage

GUO Wei ,
WANG Wenyi ,
YANG Dong ,
CUI Kai ,
ZHANG Juan ,
LIU Min ,
LI Dongmao ,
HU Xiuzhi ,
DIAO Qiyu

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1. Hebei University of Engineering, College of Life Sciences and Food Engineering, Handan 056038, China;
2. Feed Research Institute of Chinese Academy of Agricultural Sciences, Key Laboratory of Feed Biotechnology of the Ministry of Agriculture and Rural Affairs, Beijing 100081, China;
3. Scientific Research Institute of Agricultural and Animal Husbandry in Bayannaoer, Bayannaoer 015000, China

Received date: 2019-09-05

Online published: 2020-03-13

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Abstract

The aim of this study was to investigate effects of supplementation of rumen protected amino acids in low protein diets on growth performance and slaughter performance of Dorper×thin-tailed Han crossbred mutton sheep during fattening stage. The one hundred and fifty Dorper×thin-tailed Han crossbred mutton sheep (weight about 33 kg) were divided into 5 groups (3 replicates per group, 10 mutton sheep per replicate). The groups were as follows:control group (dietary crude protein level was 16%), LP14 group (dietary crude protein level was 14%), LP12 group (dietary crude protein level was 12%), LP10 group (dietary crude protein level was 10%) and LP12+NPN group (dietary crude protein level was 12%, urea level was 1%). The supplementation of rumen protected lysine, methionine, threonine and arginine reached the corresponding amino acid levels in the control group diet. The adjustment period lasted for 10 days and the experiment period lasted for 80 days. The results showed as follows:1) compared with the control group, different levels of low protein diets supplemented with rumen protected amino acids had no significant effects on average daily gain and feed conversion ratio among groups (P>0.05). 2) There were no significant differences in the slaughter performance indicators of the mutton sheep in each test group, such as pre-slaughter live weight, carcass weight, slaughter rate, GR value and loin eye muscle are (P>0.05). 3) The organ indexes of mutton sheep in each group was related to body weight, and the difference among groups was not significant (P>0.05). 4) The omasum weight and the proportion of live weight before slaughter in LP10 group were significantly higher than those in LP12 and LP12+NPN group (P<0.05), large intestine weight and the proportion of live weight before slaughter in LP10 group were significantly higher than those in control group, LP14 group和LP12+NPN group (P<0.05); protein level of diets had no significant effect on reticulum, rumen, small intestine weight and the proportion (P>0.05). The results show that compared with the control group, when the protein level of the diets decreases by 1 to 4 percentage points and adding rumen protected lysine, methionine, threonine, arginine and urea, the growth performance, slaughter performance of Dorper×thin-tailed Han crossbred mutton sheep do not significantly be affected. Low protein diets supplemented with amino acids is feasible in the fattening stage of mutton sheep.

Key words： mutton sheep; low protein diet; rumen protected amino acid; amino acid balance pattern; growth performance; slaughter performance

Cite this article

GUO Wei , WANG Wenyi , YANG Dong , CUI Kai , ZHANG Juan , LIU Min , LI Dongmao , HU Xiuzhi , DIAO Qiyu . Effects of Supplementation of Rumen Protected Amino Acids in Low Protein Diets on Growth Performance and Slaughter Performance of Dorper×Thin-Tailed Han Crossbred Mutton Sheep during Fattening Stage[J]. Chinese Journal of Animal Nutrition, 2020 , 32(3) : 1247 -1255 . DOI: 10.3969/j.issn.1006-267x.2020.03.032

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