植酸酶和复合酶对肉鸡生产性能及氮、磷利用的影响

Effects of Phytase and Compound Enzymes on Performance and Utilization of Nitrogen and Phosphorus for Meat Chickens

选用288只1日龄AA肉公鸡,随机分成4个处理组,每个处理设6个重复,每个重复12只鸡。试验日粮分别为:(1)低磷、低蛋白日粮(双低对照组);(2)低磷、低蛋白日粮+500PTU/kg植酸酶;(3)低磷、低蛋白日粮+500PTU/kg植酸酶+0.5g/kg复合消化酶(折合纤维素酶1500U/kg、木聚糖酶11500U/kg、α-半乳糖苷酶1000U/kg、酸性蛋白酶1000U/kg);(4)正常营养水平日粮(普通对照组)。结果表明:植酸酶或植酸酶+复合酶的添加显著(P<0.05)提高了肉鸡日增重和日采食量,达到、甚至趋向于超过普通对照组(P>0.05);显著(P<0.05)提高了肉鸡氮、磷利用率,进而大幅度降低氮、磷排放量。

A total of 288 newly-hatched AA broiler cockerels were randomly allotted into four dietary treatments with 6 replications of 12 birds. The four experiential diets were as follows:1) corn-soybean meal diet with phosphorus-low and protein-low(double low control), 2) double low control diet supplemented with 500 PTU/kg phytase, 3) double low control diet supplemented with 500 PTU/kg phytase and 0.2 g/kg compound enzymes, and 4) corn-soybean meal diet with normal nutrient levels(common control). The results indicated that dietary supplementation with phytase alone or phytase plus compound enzymes had significantly (P<0.05) improved ADG and ADFI, which reached or even surpassed those of common control (P>0.05), significantly (P<0.05) increased the utilization of phosphorus and nitrogen and consequently decreased excretion of phosphorus and nitrogen for broiler cockerels.