Robbins K R, McGhee G C, Osei P, Beauchene R E
Poult Sci. 1986 Dec;65(12):2226-31. doi: 10.3382/ps.0652226.
Effects of ad libitum and restricted (50% of ad libitum) feeding on performance of female broilers were assessed in a 68-week experiment. The treatments imposed were AA, fed ad libitum throughout; RR, fed restricted amounts of feed throughout; RA restricted through 24 weeks of age and ad libitum thereafter; and AR, fed ad libitum through 24 weeks and restricted thereafter. Average age at first egg was delayed by 17 days in RA hens compared with AA hens. Average body weight at first egg was 3.9 kg for RA birds and 4.5 kg for AA birds. Peak production was higher for RA birds (71 vs. 59%), but age at peak production was similar for both AA and RA hens. Through 68 weeks, AR birds produced 50% more eggs than AA birds (159 vs. 106). Cumulative number of eggs produced for RR and AR birds were 37 and 47, respectively. Mortality was similar for RR, RA, and AR birds but was approximately fourfold greater in AA birds. At 68 weeks of age, live body, carcass, abdominal fat pad, and estimated fat-free carcass weights were similar for AA and RA birds. Although abdominal fat as a percent of carcass weight was similar for AR and RR birds, average live weight, carcass weight, and fat-free carcass weight were higher for AR than RR birds at 68 weeks.
在一项为期68周的试验中，评估了自由采食和限饲（自由采食量的50%）对雌性肉鸡生产性能的影响。设置的处理组为：AA组，全程自由采食；RR组，全程限饲；RA组，24周龄前限饲，之后自由采食；AR组，24周龄前自由采食，之后限饲。与AA组母鸡相比，RA组母鸡的开产平均日龄推迟了17天。RA组鸡开产时的平均体重为3.9千克，AA组为4.5千克。RA组鸡的产蛋高峰更高（71%对59%），但AA组和RA组母鸡达到产蛋高峰的日龄相似。到68周时，AR组鸡的产蛋量比AA组多50%（159枚对106枚）。RR组和AR组鸡的累计产蛋数分别为37枚和47枚。RR组、RA组和AR组鸡的死亡率相似，但AA组鸡的死亡率约为其他三组的四倍。68周龄时，AA组和RA组鸡的活体重、胴体重、腹部脂肪垫重量以及估计的无脂胴体重相似。虽然AR组和RR组鸡腹部脂肪占胴体重的百分比相似，但68周时AR组鸡的平均活体重、胴体重和无脂胴体重均高于RR组。
