饲料中添加胆汁酸和维生素E对慢性热应激肉鸡生长性能及肝肾功能的影响

Effects of Bile Acid and Vitamin E on Growth Performance and Liver and Kidney Function of Broilers under Chronic Heat Stress

目的:研究饲料中添加胆汁酸和维生素E对慢性热应激肉鸡生长性能和肝肾功能的影响。方法:选用200只1日龄科宝500肉鸡,适应性饲养21 d,于22 d正式试验,随机分为5组,即常温对照组(CON)、热应激对照组(HS)、试验组分别添加500 mg/kg BA(BA组)、200 mg/kg VE(VE组)、500 mg/kg BA+200 mg/kg VE(BA+VE合并组),每组4个重复,每个重复10只鸡。结果:饲养至35 d,与CON对照组相比,其余各试验组平均日增重(ADG)与日采食量(ADFI)均显著性降低(P<0.01),料肉比(F/G)均显著性提高(P<0.01);35 d时,与HS组相比,BA+VE合并组尿素(UREA)显著性降低(P<0.05)。饲养42 d时,与CON组相比,各组的ADG、ADFI均显著性降低(P<0.01),F/G显著性提高(P<0.01);BA和VE组AST含量较HS组显著性降低(P<0.05),BA+VE合并组较其余各试验组直接胆红素(D-Bil)、总胆红素(T-Bil)显著性增加(P<0.01)。结论:结果表明日粮中单独添加200 mg/kg VE组或500 mg/kg BA组均可改善肉鸡在热应激条件下的日增重,改善肝肾功能,但两种添加剂联合未出现协同效应。

Objective:To study the effects of bile acid and vitamin E on growth performance and liver and kidney function of broilers under chronic heat stress.Methods:2001-day-old Cobb 500 broilers were randomly divided into 5 groups with 4 replicates in each group and 10 chickens in each replicate.500 mg/kg BA(BA),200 mg/kg VE(VE),500 mg/kg BA+200 mg/kg VE(BA+VE combination)were added to the normal temperature control group(CON),heat stress control group(HS)and experimental group respectively.Results:The average daily gain(ADG)and daily intake(ADFI)of the other experimental groups were significantly lower than those of the normal temperature control group(P<0.01),and the ratio of feed to gain(F/G)was significantly lower than those of the normal temperature control group(P<0.01).Compared with HS group,urea(UREA)in BA+VE Combination group decreased significantly at 35 days(P<0.05).Compared with normal temperature group,ADG and ADFI in each group decreased significantly(P<0.01)and F/G increased significantly(P<0.01),AST content in BA and VE groups decreased significantly(P<0.05)compared with HS group,and direct bilirubin(D-Bil)and total bilirubin(T-Bil)in BA+VE Combination group increased significantly(P<0.01).Conclusion:Dietary supplementation of 200 mg/kg VE or 500 mg/kg BA alone could increase daily gain and improve liver and kidney function of broilers under heat stress,but there was no synergistic effect between the two additives.