Effects of Rumen-Protected Methionine Supplementation in Low Protein Level Diet on Growth Performance, Nutrient Digestibilities, Plasma Biochemical and Antioxidant Indexes and Rumen Fermentation Parameters of Qianbei Brown Goats

WANG Fei; HAN E; REN Jinpeng; JIAN Shiyan; MA Zhengfa; GUO Ziyi; CHEN Xiang; WU Wenxuan

doi:10.3969/j.issn.1006-267x.2020.03.034

2020 , Vol. 32 >Issue 3: 1262 - 1271

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.03.034

Effects of Rumen-Protected Methionine Supplementation in Low Protein Level Diet on Growth Performance, Nutrient Digestibilities, Plasma Biochemical and Antioxidant Indexes and Rumen Fermentation Parameters of Qianbei Brown Goats

WANG Fei ,
HAN E ,
REN Jinpeng ,
JIAN Shiyan ,
MA Zhengfa ,
GUO Ziyi ,
CHEN Xiang ,
WU Wenxuan

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1. Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region of Ministry Education, Institute of Animal Nutrition and Feed Science, College of Animal Science, Guizhou University, Guiyang 550025, China;
2. Institute of New Rural Development, Guizhou University, Guiyang 550025, China;
3. Engineering Key Laboratory of Plateau Mountain Livestock Pollution Control and Resource Reuse Technology of Guizhou Province, Guiyang 550025, China

Received date: 2019-08-13

Online published: 2020-03-13

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Abstract

This study was conducted to investigate the effects of rumen-protected methionine (RPMet) supplementation in low protein level diet on growth performance, nutrient digestibilities, plasma biochemical and antioxidant indexes and rumen fermentation parameters of Qianbei brown goats. Eighteen Qianbei brown goats with good physical condition and similar age and body weight[(32.43±1.84) kg] were randomly divided into 3 groups with 6 replicates in each group and 1 goat in each replicate. Goats in the control was fed a basal diet (crude protein content was 12.42%) without RPMet supplementation; others in group Ⅰ and group Ⅱ were fed diets (crude protein content was 10.21%) which dietary protein level was decreased by 2% than the basal diet, and supplemented with 0.2% and 0.4% RPMet, respectively. The pre-experimental period lasted for 14 days, and the experimental period lasted for 7 days. The results showed as follows:1) there was no significant difference in the final weight, dry matter intake (DMI), average net gain (ANG), average daily gain (ADG) and feed to gain ratio (F/G) of goats among all groups (P>0.05). 2) The digestibilities of crude protein and ether extract of group Ⅱ was significantly higher than those in control group and group Ⅰ (P<0.05). 3) There was no significant difference in plasma biochemical (total protein, albumin, total amino acid, urea nitrogen, uric acid, creatinine contents and alkaline phosphatase, aspartate transaminase, alanine aminotransferase activities) and antioxidant indexes (superoxide dismutase, glutathione peroxidase, catalase activities and malondialdehyde content) among all groups (P>0.05). 4) There was no significant difference in rumen pH, ammoniacal nitrogen concentration, volatile fatty acid proportion and cellulase (microcrystalline cellulose, xylanase, cellobiase and carboxymethyl cellulose) activities among all groups (P>0.05). It is suggested that RPMet supplementation in low protein level diet has not effect on growth performance, plasma biochemical and antioxidant indexes and rumen fermentation parameters of Qianbei brown goats, and adding 0.4% RPMet can improve the digestibilities of crude protein and ether extract.

Key words： rumen-protected methionine; nutrient digestibilities; plasma biochemical indexes; rumen fermentation; Qianbei brown goats

Cite this article

WANG Fei , HAN E , REN Jinpeng , JIAN Shiyan , MA Zhengfa , GUO Ziyi , CHEN Xiang , WU Wenxuan . Effects of Rumen-Protected Methionine Supplementation in Low Protein Level Diet on Growth Performance, Nutrient Digestibilities, Plasma Biochemical and Antioxidant Indexes and Rumen Fermentation Parameters of Qianbei Brown Goats[J]. Chinese Journal of Animal Nutrition, 2020 , 32(3) : 1262 -1271 . DOI: 10.3969/j.issn.1006-267x.2020.03.034

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