摘要
本试验旨在探究在饲粮中添加酸性蛋白酶对蛋鸡产蛋性能、蛋品质、抗氧化能力和免疫功能的影响.将600 只900 日龄强制换羽30d的京红蛋鸡随机分为4 组,每组6 个重复,每个重复25 只蛋鸡.对照组饲喂基础饲粮,试验组I、II和III在饲粮中分别添加250 g/t、500 g/t和750 g/t酸性蛋白酶.预试期和正试期分别为1 周和6周.结果发现,与对照组相比,试验组II产蛋率显著提高(P<0.05),料蛋比和破蛋率显著下降(P<0.05);试验组II和III蛋壳厚度、哈氏单位和蛋壳强度显著提高(P<0.05);3 个试验组蛋鸡血清IgM、IgG和GSH-Px含量显著提高(P<0.05).综上,在饲粮中添加适量酸性蛋白酶可提高蛋鸡产蛋性能和蛋品质,同时可提高蛋鸡免疫性能和抗氧化能力,其中添加量以500 g/t为宜.
Abstract
The aim of this experiment is to investigate the effects of acidic protease on the egg laying perform-ance,egg quality,antioxidant capacity,and immune function of laying hens.A total of 600 Beijing Red laying hens,aged 900 days and forced to molt for 30 days,were randomly divided into 4 groups,with 6 replicates in each group and 25 hens in each replicate.The control group was fed with basic feed,while experimental groups I,II,and III were supplemented with 250 g/t,500 g/t,and 750 g/t acid protease in the feed,respectively.The pre tri-al period and the main trial period are 1 week and 6 weeks,respectively.The results showed that compared with the control group,the egg production rate of experimental group II significantly increased(P<0.05),while the feed to egg ratio and egg breakage rate significantly decreased(P<0.05);The eggshell thickness,Hartmann u-nits,and eggshell strength of experimental groups II and III were significantly increased(P<0.05);The serum levels of IgM,IgG,and GSH Px in three experimental groups of laying hens were significantly increased(P<0.05).In summary,adding an appropriate amount of acidic protease to the feed can improve the egg laying per-formance and quality of laying hens,as well as enhance their immune performance and antioxidant capacity.The recommended dosage is 500 g/t.
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