Rodriguez M, Owings W J, Sell J L
Poult Sci. 1984 Aug;63(8):1553-62. doi: 10.3382/ps.0631553.
An experiment was conducted to obtain information on the concept of progressively decreasing dietary phosphorus levels (phase feeding) on the performance of three different commercial layer strains. Dietary available phosphorus (AP) levels of .15, .30, or .45% were fed continuously from 22 to 70 weeks of age. Concurrently, a diet containing .35, .25, and .15% AP was phase-fed during age intervals of 22 to 34, 34 to 50, and 50 to 70 weeks, respectively. Dietary AP levels did not significantly affect egg production except the .15% AP level, which significantly reduced egg production when compared with the other three dietary AP treatments. Efficiency of feed utilization was significantly superior for hens phase-fed AP compared with hens fed the other AP treatments. There were no differences in egg weight or mortality due to dietary AP. Eggshells were significantly thicker when hens received .15% AP. The .15% AP and phase-fed regimen resulted in hens with significantly lower body weights at the end of the experiment. Hens fed .30% AP and phase-fed AP had significantly lower carcass ash and phosphorus levels. Serum phosphorus levels corresponded directly to dietary AP levels. There were no significant differences in egg production due to strain nor were there any strain by dietary treatment interactions that influenced production traits. Significant strain differences were noted in feed efficiency, egg weight, carcass ash, and carcass phosphorus.
进行了一项实验，以获取有关逐步降低日粮磷水平（阶段饲养）对三种不同商业蛋鸡品系生产性能影响的信息。日粮有效磷（AP）水平为0.15%、0.30%或0.45%，从22周龄至70周龄持续饲喂。同时，分别在22至34周、34至50周和50至70周龄期间，分阶段饲喂含0.35%、0.25%和0.15%AP的日粮。日粮AP水平除0.15%AP水平外，对产蛋量没有显著影响，与其他三种日粮AP处理相比，0.15%AP水平显著降低了产蛋量。与饲喂其他AP处理的母鸡相比，分阶段饲喂AP的母鸡饲料利用效率显著更高。日粮AP对蛋重或死亡率没有影响。当母鸡摄入0.15%AP时，蛋壳显著更厚。0.15%AP和分阶段饲喂方案导致实验结束时母鸡体重显著更低。饲喂0.30%AP和分阶段饲喂AP的母鸡胴体灰分和磷水平显著更低。血清磷水平与日粮AP水平直接相关。品系对产蛋量没有显著影响，也不存在影响生产性能的品系与日粮处理交互作用。在饲料效率、蛋重、胴体灰分和胴体磷方面存在显著的品系差异。
