γ-氨基丁酸对断奶仔猪生产性能及血清蛋白水平和酶活性的影响研究

为了研究日粮中不同添加剂量γ-氨基丁酸(GABA)对断奶仔猪平均日增重、平均日采食量、料重比及总蛋白、白蛋白水平和血清谷草转氨酶等酶活性的影响，来判断其能否提高断奶仔猪的生产性能。试验将80头断奶仔猪随机分为4个试验组，每组20头。其中试验I组为对照组，试验Ⅱ、Ⅲ、Ⅳ组日粮中分别添加15、25、45mg/kg的GABA，试验期28天，统计试验全期的生产性能指标，并测定试验结束时血清蛋白水平和酶活性。结果显示：试验猪体重、平均日增重和平均日采食量45 mg/kg添加组稍低于对照组，差异不显著(P>0.05)；15 mg/kg添加组和25 mg/kg添加组均显著(P<0.05)高于对照组；15 mg/kg添加组料重比显著(P<0.05)低于对照组；各组间血清TP、ALB的含量差异不显著(P>0.05)；血清尿素氮水平与对照组相比较，15 mg/kg添加组显著降低(P<0.05)；各试验组GOT活性均低于对照组，但差异不显著(P>0.05)；ALT活性15 mg/kg添加组极显著(P<0.01)低于对照组，显著低于(P<0.05) 45 mg/kg添加组。说明日粮中添加15 mg/kg GABA可以提高断奶仔猪的平均日增重和平均日采食量，可有效降低血清尿素氮的水平和GOT、ALT的活性。

The Effect of γ-aminobutyric on Growth Performance and Serum Levels of Protein and Enzyme Activity in Weaned Piglets

This experiment was conducted to study the effects of γ-aminobutyric acid (GABA) on average daily gain, average daily feed intake, feed weight ratio and total protein, albumin level and serum glutamic oxalacetic transaminase activity in weaned piglets. 80 weaned piglets were divided randomly into I,Ⅱ, Ⅲ, Ⅳgroups with 20 in each group. Group I was control group. Group Ⅱ, Ⅲ, Ⅳ were added by 15 mg/kg, 25 mg/kg, 45 mg/kg GABA into diets respectively. The experiment lasted for 28 days. The effects of GABA on the growth performance of weaned piglets during the entire test period were studied and the serum levels of protein and enzyme activity at the end of the test were detected. The results showed that, the ABW and ADFI and ADG of group 15 mg/kg GABA was slightly less than the control group (P>0.05), and the group 15 mg/kg, 25 mg/kg GABA was significantly enhanced, compared with the control group (P<0.05); compared with the control group，the F/G of the group 15 mg/kg GABA was significantly lowered (P<0.05); There was no significant difference in serum TP, ALB content (P>0.05); compared with the control group, serum urea nitrogen level decreased significantly in the add group of 15mg/kg GABA(P<0.05); The test group GOT activity was lower than that of control group (P>0.05); The activity of ALT the group 15 mg/kg was significantly lower than that of the control group (P<0.01), and than that of the group 25 mg/kg GABA (P<0.05). The results indicated that 15 mg/kg GABA could improved average daily gain, average daily feed intake of weaning pigs, reduced effectively the level of serum urea nitrogen and GOT, ALT activity.