三种饲养模式下“农大3号”蛋鸡产蛋高峰期生产性能比较

Production Performance Comparison of Nongda Ⅲ Dwarf Layers in Laying Peak Period under Three Different Rearing Systems

试验将6100只＂农大3号＂节粮小型蛋鸡按不同的饲养模式分为3组进行饲养,3种饲养方式分别为：林下小群放养、厚垫料地面平养以及＂两低一高＂混合地面平养。林下低密度放养在20栋6m2鸡舍中共饲养600只母鸡;厚垫料地面平养在1栋100m2鸡舍中饲养500只母鸡;混合地面平养在1栋1000m2鸡舍中饲养5000只母鸡。结果表明,在产蛋高峰期（试验测定了25~31周龄的生产性能数据）,厚垫料地面平养条件下蛋鸡产蛋率为90.35%,显著高于林下放养（89.15%）和混合地面平养（87.79%）;混合地面平养和垫料地面平养条件下日耗料、平均蛋重差异均不显著（P〉0.05）,林下放养日耗料偏高、平均蛋重偏低,料蛋比偏高,达到显著水平（P〈0.05）;垫料地面平养下蛋鸡死淘率为2.09%,显著高于混合地面平养（0.47%）和林下放养（0.59%）;鸡蛋合格率,林下放养（98.87%）高于混合地面平养（97.10%）,垫料地面平养（90.70%）最低,各组差异均显著（P〈0.05）。

In this study, we divided 6 100 Nongda Ⅲ dwarf layers into three different groups according to their different rearing systems,which were free range under woods with small flock size,deep-litter floor rearing and enrichedfloor rearing. In free-range system,we kept 600 layers in 20 small houses,each of which was about 6 m^2;In deep-litter system,500 layers were raised in one house of 100 m^2;In enriched floor-rearing system,5 000 layers were kept in one house of 1 000m2. The results indicated that,during the laying peak period （25 to 31 weeks of age）,laying rate of deep litter （90.35%） was significantly （P〈0.05） higher than that of both free range （89.15%） and enriched floor rearing （87.79%）;Deep litter and enriched floor rearing shared similar daily feed intake and average egg weight （P〈0.05）, while free range had higher daily feed intake and lower average egg weight which led to a higher feed-egg ratio （P〈0.05） ;Mortality of deep litter was 2.09%,which was significantly higher than that of both free range （ 0.59% ） and enriched floor rearing（0.47%）;As to egg qualified rate,free range （98.87%）was significantly higher than both free range （97.10%） and enriched floor rearing（90.70%）.