不同钙磷水平及添加植酸酶对育肥蛋公雏饲养效果的影响

Influences of diets with different Ca and P levels and with added phytase on the feeding results of fattening egg-type cockerels

６００ 只１ 日龄商品代蛋公雏被均等分为３ 组，分别给以按国标肉仔鸡饲养标准设计的高钙磷日粮（ Ｃ Ｋ 组） ，将 Ｃ Ｋ 组磷酸氢钙减少５０ ％ 设计的低钙磷水平日粮（ 试Ⅰ组） 及在试Ⅰ组基础上按每ｋｇ 日粮添加０２ ｇ 植酸酶（ 试Ⅱ组） ，探讨不同钙磷水平及添加植酸酶对育肥蛋公雏饲养效果的影响结果表明（ 全期） ： Ｃ Ｋ 组较试Ⅰ组的各项生产性能均有所降低，虽差异均不显著（ Ｐ＞ ００５） ，但日增重、采食量、料重比分别降低２７０ ％ ，２５９ ％ 和０３７ ％ ，经济效益降低３５７ ％ ，显然试Ⅰ组的钙磷水平不能满足育肥蛋公雏的营养需要试Ⅱ组和 Ｃ Ｋ 组比较，采食量和料重比分别降低３７８ ％ 和４０３ ％ ，差异均显著（ Ｐ＜ ００５） ，日增重和经济效益分别提高０２４ ％ 和０４６ ％ ，试Ⅱ组的经济效益和 Ｃ Ｋ 组接近，但日粮中加入植酸酶后，减少了粪便磷排泄量，有利于控制环境污染。

To study the influences of diets with different calcium(Ca) and phosphorus (P) levels and with added phytase on the fattening results of egg-type cockerels,600 one day egg-type cockerels were divided into three groups and fed with diet in which higher level of Ca and P were designed according to the National Feed Standard of Broilers(control group),low Ca-P level diet which contained 50% CaHPO 4 of the control group (group Ⅰ) and diet which was added with 0.2 g·kg -1 phytase on the basic diet of group Ⅰ (group Ⅱ) respectively.The results showed that compared with the control group,the production indexes of group Ⅰ were all lower with no significant differences (P >0.05),but its daily gain,feed intake and feed conversion ratio decreased by 2.7%,2.59% and 0.37% respectively,the economic benefit reduced by 3.57%.So,obviously,the Ca and P level of group Ⅰ diet couldn't meet the nutritinonal requirement of fattening egg-type cockerels.Compared with the control group,its feed intake and feed conversion ratio of group Ⅱ decrased by 3.7% and 4.03% respectively with significant differences (P <0.05),the daily gain and economic benefit increased by 0.24% and 0.46% respectively. The economic benefit of group Ⅱ was almost the same as the control group,but after the diet was added with phytase,the reduction of phosphorus in feces was favourable to the control of the environmental pollution.So,it was proper to feed egg-type cockerels with low Ca-P level diet added with phytase.