植酸酶对褐壳蛋用母雏日粮中总磷及植酸磷存留率影响的研究

Studies on Effects of Microbial Phytase on Total Phosphorus and Phytate Phosphorus Retention for Laying Chicken

选用３００只５周龄北京红鸡雏母鸡，随机分成５个处理组，每组４个重复，每个重复１５只鸡．试验设两个总磷（ＴＰ）水平，即ＴＰ＝０．５％为负对照组，ＴＰ＝０．７％为正对照组，并在ＴＰ＝０．５％的基础日粮中添加植酸酶５００、７００、１０００ＦＴＵ／ｋｇ．采用外源指示剂法收集粪便，测定雏鸡对ＴＰ及植酸磷（ＰＰ）的存留率．结果表明：正对照组ＴＰ、ＰＰ排泄量最高，负对照组加酶５００ＦＴＵ／ｋｇ时，ＴＰ、ＰＰ排泄量最低，负对照组及加酶组与正对照组差异极显著（Ｐ＜０．０１）；负对照组ＴＰ、ＰＰ的表观存留率最低，加酶７５０ＦＴＵｋｇ组ＴＰ、ＰＰ表观存留率最高。

A 1 week metabolism experiment on phosphorus and Phytate Phosphorus of Laying Chicken was conducted.300 5-week chicks arranged to five groups with four replicates and 15 chicks each replicate.A Basal diet with 0 5%TP(negative control)or adding 500 750 1000FTU/kg phytase and a diet with normal P level(positive control:0.7%TP)were formulated as five treatments.Excretion was collected with the chromic oxide indication method.Metabolism experiment results showed that feces TP PP excretion of positive control is significantly higher than other four groups and 500FTU/kg phytase group is the lowest.TP PP retention of negative control is significantly lower than other four groups and retention percentage of 750FTU/kg phytase group is the highest.