Cunningham D L
Poult Sci. 1984 Dec;63(12):2352-7. doi: 10.3382/ps.0632352.
Three controlled feeding programs initiated after peak egg production and a full feeding program were evaluated for their effects on production and income performance of White Leghorn layers. Program 1 consisted of full feeding from 20 to 64 weeks of age. Controlled feeding programs were initiated at 36 weeks and consisted of feeding approximately 105 g/bird/day to 64 weeks (Program 2), a phase reduction feeding program consisting of feeding approximately 105 g/bird/day to 53 weeks of age followed by feeding approximately 95 g/bird/day to 64 weeks (Program 3), and feeding approximately 95 g/bird/day continuously from 36 weeks (Program 4). Controlled feeding programs resulted in significant (P less than .05) reductions in total feed usage compared to full fed birds. Eggs per hen, however, were significantly (P less than .05) reduced only for feeding Programs 3 and 4, and egg weights were reduced only with feeding Program 4. Egg mass production and body weights were significantly affected by controlled feeding programs. Egg grade distributions were not significantly (P greater than .05) different among Programs 1, 2, or 3; however, Program 4 produced a significant (P less than .05) increase in the percentage of medium grade eggs obtained. Egg incomes over pullet and feed costs favored all controlled feeding programs, demonstrating that maximum production levels do not always mean maximum returns.
在产蛋高峰期后启动了三个控制饲喂方案，并评估了一个全量饲喂方案对白来航母鸡生产性能和收益表现的影响。方案1包括从20周龄到64周龄进行全量饲喂。控制饲喂方案在36周龄时启动，方案2为到64周龄时每天每只鸡饲喂约105克；方案3是一个阶段减量饲喂方案，即到53周龄时每天每只鸡饲喂约105克，然后到64周龄时每天每只鸡饲喂约95克；方案4是从36周龄起每天每只鸡持续饲喂约95克。与全量饲喂的鸡相比，控制饲喂方案使总饲料用量显著（P<0.05）减少。然而，仅方案3和方案4的每只母鸡产蛋数显著（P<0.05）减少，且仅方案4的蛋重有所降低。蛋产量和体重受到控制饲喂方案的显著影响。方案1、2或3之间的蛋品等级分布没有显著（P>0.05）差异；然而，方案4获得的中等等级鸡蛋百分比显著（P<0.05）增加。扣除雏鸡和饲料成本后的蛋收入对所有控制饲喂方案都有利，这表明最高生产水平并不总是意味着最高回报。
