对产蛋鸡实用日粮中铜、铁、锌、锰平衡供应方案的探讨

Research on Balance Supply of Copper,Ferrite,Zinc and Manganese in Practical Diets for Layers

探讨蛋鸡铜、铁、锌、锰的补充方案。试验1选用420只19周龄罗曼褐壳蛋鸡,随机分为4处理,每处理7重复,每重复15只。试验2选用360只39周龄罗曼褐壳蛋鸡,随机分为4处理,每处理6重复,每重复15只。以基础饲粮铜、铁、锌、锰的实测值为基础,结合1994年NRC逐步平衡饲粮4种元素。结果显示,两试验基础日粮配方相似,但铜、铁、锌、锰含量差异较大。试验1依次添加锌、铜、锰提高产蛋率,不影响铜、铁、锌的表观利用率,显著影响锰的表观利用率。试验2依次补充锰、铜、锌降低产蛋率和4种元素的表观利用率。从生产性能考虑,1994年NRC中铜、铁、锌、锰的比例不适宜作为微量元素的最佳平衡比,典型蛋鸡饲粮中锌是产蛋性能的限制性因素。

The scheme of supplementing copper, ferrite, zinc and manganese for layers was researched. 420 brown-shell Luoman layers in age of 19 weeks were selected for Treatment Ⅰ and divided into four groups randomly with 7 replications in each group. 360 brown-shell Luoman layers in age of 39 weeks were selected for Treatment Ⅱ and divided into four groups randomly with 6 replications in each group, 15 layers in each replication. Four elements were gradually balanced based on practical detected values of copper, ferrite, zinc and manganese in basal diets, in combination of NRC （1994）. The results indicated that the formulas of basal diets in two tests were similar, but the contents of copper, ferrite, zinc and manganese were significantly different. Copper, ferrite and manganese were orderly added in Treatment I, the egg-laying rate was improved, but the apparent utilization of copper, ferrite and zinc was not effected, while the apparent utilization of manganese was significantly effected. Manganese, copper and zinc were orderly added in Treatment II, the egg-laying rate and the apparent utilization of these four elements were decreased. Under consideration of production performance, the ratio of copper, ferrite, zinc and manganese in NRC （1994） could not be suitable for the optimum balance ratio of microelements, and zinc was a restrictive factor for egg-laying performance.