低磷日粮中添加植酸酶对蛋鸡肠道形态结构的影响

试验旨在研究在低磷的玉米-豆粕型日粮中添加植酸酶对蛋鸡肠道形态结构的影响。选用18周龄体重、产蛋周龄相近的伊莎褐蛋鸡840羽,随机分成7组:正、负对照组及在负对照组基础上分别添加300、1000和10000U/kg的包衣状植酸酶、300U/kg的粉状及300U/kg的微丸状植酸酶(试验Ⅲ、Ⅳ、Ⅴ、Ⅵ和Ⅶ组)。结果表明:与负对照组相比,Ⅳ组的空肠绒毛高度得到了显著提高(P<0.05),Ⅲ、Ⅴ、Ⅵ和Ⅶ组与之相比无显著差异(P>0.05),但分别提高了16.49%、21.80%、15.73%以及17.29%;隐窝深度、绒毛高度/隐窝深度、黏膜厚度与之相比差异不显著(P>0.05)。各试验组间以及试验组与正对照组之间亦无显著差异(P>0.05)。因此,在低磷日粮中添加植酸酶对蛋鸡肠道结构具有一定的改善作用。

Effects of a low-available phosphorus diet supplemented with phytase on mucosal structure in jejunum of laying hens

An experiment was conducted to evaluate the effects of a low-AP diet supplemented with phytase on the mucosal structure of small intestine in laying hens.A total of eight hundred and forty 18-week-old laying hens were randomly allocated into 7 groups.Group I,as the positive control,was fed with the basal diet,Group II,as the negative control,was fed with low-available phosphorus(AP) diet,while group III,IV,and V were fed with low-AP diet adding coated dosage-form phytase at three levels (300,1 000,and 10 000 U/kg,respectively),group VI and VII were supplemented with 300 U/kg phytase with powdery and granular dosage-form,respectively.The results indicated that:compared with the negative control,the jejunum villus height in group Ⅳwas increased significantly (P<0.05),while Ⅲ,Ⅴ,Ⅵ,and Ⅶ did not differ significantly (P>0.05) with improved by 16.49%,21.80%,15.73%,and 17.29%,respectively.The crypt depth,villus height/crypt depth and mucosal thickness in trial groups did not differ significantly(P>0.05) compared with negative control,there were also no differences among the positive control and the trial groups(P>0.05).It was concluded that low-AP diets supplemented with phytase could improve mucosal structure of small intestine in laying hens to some degree.