复合蛋白酶和甘露寡糖对肉鸡消化道的影响及其互作效应研究

试验选用1日龄、平均体质量为(37.6±0.42)g的爱拨益加肉雏鸡112羽以研究蛋白酶和甘露寡糖对肉鸡消化道的影响及其互作效应。随机将试验鸡只分为4个组,每组4个重复,每个重复7羽鸡。试验分两个阶段,即前期(1～21 d)和后期(22～42 d)。试验组曰粮在玉米.豆粕日粮的基础上分别添加125 g/t的蛋白酶、1 000g/t的甘露寡糖及125 g/t的蛋白酶+1 000 g/t的甘露寡糖。结果表明:与对照组相比,日粮中添加125 g/t的蛋白酶对21日龄肉鸡腺胃和肌胃相对重有降低的趋势(P>0.05),但显著提高了42日龄肉鸡的腺胃相对重(P<0.05)和日增重(P<0.01),对小肠(十二指肠、空肠、回肠)相对重略有提高(P>0.05);日粮添加1 000 g/t的甘露寡糖对肉鸡腺胃和肌胃的相对重也有降低的趋势(P>0.05),而对21日龄和42日龄肉鸡小肠相对重也略有提高(P>0.05),从全期以及整个生长期(1～42日龄)来看日增重并无显著提高作用(P>0.05)。随着日龄的增加3个试验组日增重有增加的趋势(P>0.05)。日粮添加125 g/t的蛋白酶+1 000 g/t的甘露寡糖对21日龄和42日龄肉鸡腺胃、肌胃、日增重和小肠相对重均没有明显的互作效应。

Effects of Complex Protease and Mannan-oligosaccharide on Digestive Tract of Broilers and Their Interaction

A total of 112 one-day-old AA broilers with average body weight of(37.6±0.42 )g were used to investigate the effects of complex proteinase and mannan-oligosaccharide on the digestive tract and their interaction. The broilers were randomly allotted to 4 groups with 4 replicates of 7 birds each.The trial period contained two stages of 1-21 d and 22-42 d.The broilers were fed with 1 of 4 diets:a basal diet(control group),a basal diet supplemented with 125 g/t proteinase,a basal diet supplemented with 1 000 g/t mannan-oligosaccharide,and a basal diet supplemented with 125 g/t proteinase and 1 000 g/t mannan-oligosaccharide.The results indicated that the supplementation with 125 g/t proteinase tended to decrease(P>0.05) the relative weights of glandular and muscular stomach of 21-day-old broilers,but significantly increased(P<0.05) the relative weights of glandular stomach of 42-day-old broilers compared with the control group.The relative weights of small intestine (duodenum,jejunum,ileum) slightly increased in the broilers fed with diet supplemented with proteinase alone (P>0.05) as compared to the control broilers.The dietary 1000 g/t mannan-oligosaccharide supplementation tended to decrease(P>0.05) the relative weights of glandular and muscular stomach,and to increase(P>0.05) relative weights of small intestine of 21- and 42-day-old broilers.The daily weight gains in broilers with the dietary supplementation tended to increase with age.No interaction effect between 125 g/t proteinase and 1 000 g/t mannan-oligosaccharide was observed on the relative weights of glandular stomach,muscular stomach and small intestine of both 21- and 42-day-old broilers.