木聚糖酶对肉仔鸡生产性能的影响

Effect of xylanase on the growth performance of the broiler chicken

768羽1日龄AA肉仔鸡,随机分为6个处理,每个处理分8个重复,每个重复16羽肉仔鸡(公母各半)。6个处理分别为玉米-豆粕型日粮添加木聚糖酶0和1000IU/kg处理组,小麦-玉米-豆粕型日粮添加木聚糖酶0,500,1000和1500IU/kg处理组。试验采用4层立体网上养殖(使用上面3层),饲养周期为1～6周龄(前期和中期)。研究玉米和小麦基础日粮中单独使用木聚糖酶对肉仔鸡生产性能的影响。结果表明:玉米-豆粕型日粮中添加1000IU/kg的木聚糖酶对肉仔鸡前期和后期的生长性能无显著影响(P>0.05),但有改善的趋势;小麦-玉米-豆粕型日粮中添加木聚糖酶提高了肉仔鸡的采食量,改善了肉仔鸡的饲料转化效率(P<0.05);小麦-玉米-豆粕型日粮中3个木聚糖酶添加水平之间对肉仔鸡生产性能无显著影响,同样对肠道食糜黏度无影响,提示在本研究条件下500IU/kg木聚糖酶能满足分解木聚糖的需要;尽管小麦-玉米-豆粕型添加木聚糖酶改善了动物生产性能,但仍显著低于玉米-豆粕型日粮,提示在生产实践中单独添加一种酶的作用是有限的。

The study was conducted to compare the effect of xylanase supplementation on growth performance of broiler fed with corn-soybean meal and wheat-corn-soybean meal.768 1-day old AA broilers were randomly allocated into 6 groups with 8 replicates per group and 8 male birds and 8 female birds per replicate.Two groups were fed with corn- soybean meal supplemented with 0 and 1000 IU/kg xylanase.Four groups were fed with wheat-corn-soybean supplemented with 0,500,1000,1500 IU/kg xylanase.The results showed that the addition of xylanase for 1000 IU/kg have the trend of improving the performance of the broilers from 1 - 3 weeks and 4 - 6 weeks.Xylanase added in the wheat-corn-soybean meal diet had significantly improved the feed intake and feed conversation of the broilers from 1 - 3 weeks and 4 - 6 week（P 〈 0.05）comparing to control group and increased the chymeviscosity（P 〈 0.05）.But there were no significant differences between the three levels of the addition of xylanase in the wheat-soybean meal on performance and chymeviscosity of the broilers.It could be concluded that 500 IU/kg was good enough to improve the performance of broilers under this feed condition.And other enzyme should be used in wheat-soybean meal to further improved the performance of the broilers.