植酸酶对种鸡生产性能及种蛋孵化性能影响的研究

种鸡在生产条件下，利用植酸酶水解饲料中植酸的原理，观察商品植酸酶替代磷酸氢钙对种鸡生产性能和种蛋孵化性能的影响和评价其实际可应用性。选用２８～３６周龄的肉用黄种鸡（ＮＫ２７１），在饲料中添加３００单位植酸酶替代磷酸氢钙（ＤＣＰ）提供的１．８ｇ无机磷。结果表明：植酸酶使种鸡的产蛋率（＋０．６６％）、日耗料量（－０．７１％）、破蛋率（－９．３％）、不合格种蛋（－４．９５％）、种蛋受精率（＋０．２９％）和１２天活胚率（＋０．７８％）均得到改善，但差异不显著（Ｐ＞０．０５）；而入孵种蛋健雏率（＋１．８９％）、１２天活胚蛋健雏率（＋１．６６％）和残次雏率（－１６．１１％）则优于对照组，差异极显著（Ｐ＜０．０１）。因此，可以认为不仅在种鸡饲料中可用商品植酸酶替代磷酸氢钙，而且对种鸡和种蛋的几乎全部重要生产和繁殖指标，都有不同程度的良好作用。根据目前市场上磷酸氢钙的品质（含氟量）状况，使用植酸酶能够大幅度减轻以至于杜绝由磷酸氢钙导致的氟中毒问题。同时能够预见，使用植酸酶可以大幅度降低排泄物中的含磷量，并能减少对自然环境的污染。可见，植酸酶在种鸡饲料中具有重要的实际应用价值。

Effect of Phytase on Laying Performance of Breeder Hens and Hatching Egg Fertility

The study were carried out with total 4800 breederhens(2 treatments *800 replicates *3 birds) during a feeding trial period between 28-36 weeks of age and followed 13 hatching batches of eggs. The trial treatments were DCP diet with supplementation of inorganic phosphate on practice level and Phytase diet added 300 FTU microbial phytase per kg diet with reducing inorganic phosphate dose 0.18g DCP phosphorus. Compare with DCP diet, most important results were as follow: phytase diet showed better parameters of egg production(+0.66%), feed consume(- 0.71 %),broken egg rate(-9.3%),unqualified breeding egg rat(-4.95%), fertilizing egg rate(+0.29%) and living embryonic egg rate(+0.78%) but no significant difference(P>0.05); hatchability of hatching egg(+1.89%), hatchability of living embryonic egg(+1.66%) and unqualified chick rate(-16.11%) were high significant better(P<0.01) than birds fed DCP diet. Adding phytase not only can replace DCP with a striking economic concern, but also improve breeder production performance and hatching egg fertility. WT5”HZ〗