摘要
Abstract
This experiment aimed to investigate the effects of adding different levels of coated γ-aminobutyric acid(GABA)to the diet on the growth performance,meat quality,slaughter performance,and intramuscular fatty acid composition of lambs.A total of 64 healthy 2-month-old male lambs of the Du-Han crossbreed with similar body weight(20.50±1.20 kg)and good health status were selected and randomly divided into 4 groups,with 4 replicates in each group and 4 lambs in each replicate.The control group(CON)was fed the basal diet,while the experimental groups were supplemented with 50 mg/kg(G1),100 mg/kg(G2),and 150 mg/kg(G3)of coated GABA in the basal diet.The pre-test period was 14 days,and the main test period was 70 days.The results showed:(1)Compared with the CON group,the average daily gain(ADG)of lambs in the G2 group and G3 group was significantly increased(P＜0.01),and the feed-to-weight ratio(F/G)was significantly decreased(P＜0.01).The ADG of the G2 group was significantly higher than that of the G3 group(P＜0.05),and there was no significant difference between the G1 group and the CON group(P＞0.05);(2)The pre-slaughter live weight and carcass weight of the G2 group were significantly higher than those of the other groups(P＜0.01),the slaughter rate and eye muscle area were significantly higher than those of the CON group and the G1 group(P＜0.05),but there was no significant difference between the G3 group(P＞0.05);(3)The pH at 45 minutes and 24 hours of the longest back muscle of the G2 group was significantly higher than that of the CON group(P＜0.05),and the drip loss and shear force were significantly lower than those of the CON group(P＜0.05).The above indicators of the G1 group and G3 group were not significantly different from those of the CON group(P＞0.05);(4)The total unsaturated fatty acid(UFA)content in the intramuscular tissue of the G2 group was significantly higher than that of the CON group and the G1 group(P＜0.05),with significantly increased contents of oleic acid and linoleic acid(P＜0.05),and significantly decreased saturated fatty acid content(P＜0.05).The indicators of each fatty acid in the G3 group were not significantly different from those of the G2 group(P＞0.05).In summary,adding 100 mg/kg of coated GABA to the diet can effectively improve the growth performance,meat quality,and slaughter performance of lambs and optimize the intramuscular fatty acid composition.关键词
γ-氨基丁酸/生长性能/肉品质/屠宰性能/肌内脂肪酸Key words
gamma-aminobutyric acid/growth performance/meat quality/slaughter performance/intramuscular fatty acid分类
农业科技
