饲粮添加包被γ-氨基丁酸对断奶羔羊生长性能、血清激素及瘤胃发酵功能的影响OA北大核心CSTPCD

This experiment was conducted to investigate the effects of coated γ-aminobutyric acid(GABA)on the growth performance,rumen fermentation parameters,and serum hormone levels of lamb.A total of 60 healthy weaned lamb were randomly divided into four groups with three replicates per group and five lambs per replicate.Lambs in each group were fed 0(control group),100(GABA1 group),150(GABA2 group)and 200 mg/kg(GABA3 group)coated GABA of diet,respectively.The pre-feeding period was one week and the formal experiment period was four weeks.The results showed that compared with the control group,the final weight and average daily gain of lambs in GABA2 group were significantly increased(P＜0.05),and the ratio of feed to gain was significantly decreased(P＜0.05).The levels of cholecystokinin in all coated GABA were significantly decreased(P＜0.01).The level of neuropeptide Y in GABA2 group and GABA3 group was significantly increased(P＜0.05),and the level of norepinephrine was significantly decreased(P＜0.05).The level of serotonin in GABA2 group was significantly increased(P＜0.05),and the level of dopamine was significantly decreased(P＜0.05).The activity of alkaline phosphatase in serum of lambs in GABA2 group was significantly increased(P＜0.05),and the activity of glutamic oxalacetic transaminase was significantly decreased(P＜0.05).Rumen mycoprotein content in GABA2 group was significantly increased(P＜0.05).The study indicates that coated GABA can promote the growth performance of lambs,improve rumen mycoprotein synthesis,improve serum hormone to relieve weaning stress,and the optimal supplemental level is 150 mg/kg.