江西农业大学学报2017，Vol.39Issue(6)：1220-1225,6.DOI:10.13836/j.jjau.2017158
过瘤胃γ-氨基丁酸包被材料优化及其对肉牛热应激状态下生产性能的影响
Optimization of Rumen Protected γ-aminobutyric Acid and Its Effect on Production Performance of Beef Cattle under Heat Stress
摘要
Abstract
This experiment was conducted to investigate the effects of rumen protectedγ-aminobutyric acid ( RP-GABA) on production performance in heat-stressed beef cattle. In vitro,the RP-GABA film-coated with 1%,2%,3% polyacrylic resin Ⅱ was evaluated for its stability in rumen and release rate in gut,then 8,16, 24,and 32 mg RP-GABA per day per cattle were employed to resist heat stress in Jinjiang Yellow Cattle. Fol-lowing 24 hours cultivation in the rumen fluid, the protective rates in rumen were 49. 95%, 79. 94% and 85.35% respectively;the release rates were 88.24%,70.51% and 89.55% respectively after cultivation in the intestinal juice for 8 hours.In view of this,high bioavailability came from 3% polyacrylic resinⅡ,so 3% poly-acrylic resin Ⅱwas selected to prepare RP-GABA as film-coating.The effects of RP-GABA on production per-formance showed that:compared to the control group,the daily gain of the test group increased,the most signif-icant increase was found in the 16 mg/kg group,the average daily gain increased by 28.30%(P<0.05),the feed weight ratio reduced by 24. 62%( P<0. 05 ) , but there was no significant difference in feed intake ( P>0.05) . It is concluded that RP-GABA can improve the production performance of heat-stressed beef cattle, and the optimum dose of pure GABA is 7.5~10.0 mg/d per kilogram of body weight.关键词
肉牛/聚丙烯酸树脂II/γ-氨基丁酸/热应激Key words
beef cattle/polyacrylic resin II/rumen protected γ-aminobutyric acid/heat stress分类
农业科技引用本文复制引用
郭坤,袁志平,朱元军,曹华斌,胡国良,杨食堂,杨建军,罗军荣..过瘤胃γ-氨基丁酸包被材料优化及其对肉牛热应激状态下生产性能的影响[J].江西农业大学学报,2017,39(6):1220-1225,6.基金项目
江西省科技支撑计划重点项目(20151BBF60046)和国家现代农业产业技术体系资助项目(CARS-38) Project supported by the Jiangxi Science and Technology Support Program(20151BBF60046)and Modern Agri-cultural Industry Technology System of China(CARS-38) （20151BBF60046）
