饲料代谢能水平对农大3号小型蛋鸡生产性能的影响

180只140日龄的农大3号小型蛋鸡随机平均分为A、B、C、D、E五组,每组6个重复,每个重复6只鸡,体重大小基本一致,各组间生产性能差异不显著。分别饲喂代谢能水平11.5MJ/kg、11.3MJ/kg、11.1MJ/kg、10.9MJ/kg和10.7MJ/kg的饲料,其他营养成分含量设计上保持一致。通过30周的观察,发现在产蛋高峰前饲喂稍低能值的饲料(10.9MJ/kg)有利于采食量的增加和产蛋率的迅速上升。在一定饲料代谢能值范围内,饲料能值的高低对小型蛋鸡采食量影响不显著,所以从产蛋高峰期开始,必须使用代谢能水平较高的日粮,才能满足小型蛋鸡维持高产蛋率对能量的需求。综合来看,饲料代谢能为11.3MJ/kg时,小型蛋鸡有较高的产蛋量和饲料报酬。

The effects of dietary metabolizable energy (ME) on performance of Nongda No.3 (small egg laying hen)

The experiment was conducted to study the effects of dietary metabolizable energy (ME) on performance of Nongda No. 3 (small egg laying hen). 180 laying hens of 140 days age were allocated into 5 groups (6 replications per group) to be given five different rations with ME level (MJ/kg) 11.5, 11.3, 11.1, 10.9 and 10.7 respectively and other dietary nutrients were same among the groups. The trial period continued for 30 weeks. The results indicated that: 1. Feeding diet of low level ME before peak of egg production was benefit to improving feed intake and laying rate. 2. The diet of high level ME must be used from beginning of the peak of egg production in order to meet the need of high laying rate, for ME level at a certain scope had no significant effect on feed intake. In a word, the small egg laying hens fed diet of ME 11.3 MJ/kg had a high laying performance and egg-feed ratio.