复合酸化剂对肉鸡消化道pH和消化酶活性的影响

Effects of Compound Acidifier on pH and Digestive Enzymatic Activities in Digestive Tracts of Broilers

本试验旨在研究饲粮中添加不同剂量复合酸化剂对肉鸡消化道pH和消化酶活性的影响,并筛选出肉鸡饲粮中适宜的复合酸化剂添加水平。试验选取1日龄爱拔益加(AA)肉公鸡648羽,分为6个组,每个组6个重复,每个重复18羽鸡。对照组饲喂基础饲粮,试验组在基础饲粮中分别添加0.10%、0.15%、0.20%、0.25%和0.30%复合酸化剂。试验期42d。结果显示,复合酸化剂显著影响了肉鸡42日龄嗉囊、十二指肠、空肠和回肠的pH(P<0.05),均与复合酸化剂添加水平呈显著一次线性关系(P<0.05);显著影响了肉鸡42日龄腺胃和肌胃胃蛋白酶的总酶、酶活性和激活度(P<0.05),均与复合酸化剂添加水平呈显著的一次线性关系(P<0.05);显著影响了肉鸡42日龄小肠内淀粉酶和脂肪酶活性(P<0.05),均与复合酸化剂添加水平呈显著的一次线性关系(P<0.05),对小肠胰蛋白酶和糜蛋白酶活性影响不显著(P>0.05)。由此可见,饲粮添加0.10%复合酸化剂时,肉鸡的消化道消化酶活性最佳。

This experiment was conducted to evaluate the effects of dietary supplemented with different compound acidifier on p H and digestive enzymatic activity of digestive tracts of broilers,in order to detect the best supplemental level of compound acidifier in broiler diet.A total of 648 one-day-old Arbor Acre（AA） broilers were randomly assigned to 6 groups with 6 replicates per group and 18 birds per replicate.Broiler in the control group were fed a basal diet,and the others were fed basal diets supplemented with 0.10%,0.15%,0.20%,0.25% and 0.30% compound acidifier,respectively.The experiment lasted for 42 days.The results showed as follows： compound acidifier had significant effects on p H of crop,duodenum,jejunum and ileum of broilers at42 days of age（P〈0.05）,and showed a linear correlation（P〈0.05）.Compound acidifier had significant effects on total enzyme,enzyme activity and activity ratio of pepsin in muscular stomach and glandular stomach of broilers at 42 days of age（P〈0.05）,and showed a linear correlation（P〈0.05）.Compound acidifier had significant effects on the activities of amylase and lipase in small intestine and showed a linear correlation（P〈0.05）,which showed no significant effects on the activities of trypsase and chymotrypsin in small intestine（P〈0.05）.In conclusion,the dosage of compound acidifier in broiler diet for the optimal digestive enzymatic activity of digestive tract is 0.10%.