Sexton K J, Renden J A
Department of Poultry Science, Auburn University, Alabama 36849-5416.
Poult Sci. 1988 May;67(5):835-41. doi: 10.3382/ps.0670835.
Broiler breeder males were randomly assigned at 3 wk of age to one of three feeding treatments: 1) limited amount daily feeding (LD), 2) skip-a-day feeding (SAD), or 3) limited time feeding (LT). The same diet (16% CP and 3,011 kcal ME/kg) was provided from 3 to 22 wk of age to each treatment. The amount of feed or feeding time was adjusted to maintain recommended BW across treatments. At 22 and 34 wk of age, testes and gastrointestinal (GI) weights and carcass compositions were obtained. From 22 to 34 wk, birds were individually caged and fed ad libitum a breeder diet (15.5% CP and 2,878 kcal ME/kg). Males were ejaculated twice weekly, and BW and semen characteristics were recorded weekly. No significant differences existed among treatments for BW or body composition at 22 wk, but SAD birds had heavier crops and lighter gizzard weights than either LD or LT birds. Sexual maturity occurred 10 days earlier in the LD group than the SAD group; however, the LD group had reduced semen yields and spermatozoa concentrations compared to those in the SAD group. At 34 wk, there were no significant differences among body or GI weights, body moisture, or ash among the treatment groups. Birds in the LD group had heavier livers, greater amounts of body fat, smaller testes, and reduced body protein than those in the other treatments.
肉种鸡公鸡在3周龄时被随机分配到三种饲养处理之一：1）每日限量饲喂（LD），2）隔日饲喂（SAD），或3）限时饲喂（LT）。从3周龄到22周龄，给每个处理组提供相同的日粮（粗蛋白含量16%，代谢能3011千卡/千克）。调整饲料量或饲喂时间以维持各处理组间推荐的体重。在22周龄和34周龄时，测定睾丸和胃肠道重量以及胴体组成。从22周龄到34周龄，将鸡单独关笼，自由采食种鸡日粮（粗蛋白含量15.5%，代谢能2878千卡/千克）。每周对公鸡采精两次，并每周记录体重和精液特征。22周龄时，各处理组间的体重或体组成无显著差异，但隔日饲喂组的嗉囊比限量饲喂组或限时饲喂组的更重，而肌胃重量更轻。限量饲喂组的性成熟比隔日饲喂组早10天；然而，与隔日饲喂组相比，限量饲喂组的精液产量和精子浓度较低。在34周龄时，各处理组间的体重、胃肠道重量、体水分或灰分均无显著差异。与其他处理组相比，限量饲喂组的鸡肝脏更重、体脂肪含量更高、睾丸更小且体蛋白含量更低。
