Bish C L, Beane W L, Ruszler P L, Cherry J A
Poult Sci. 1984 Dec;63(12):2450-7. doi: 10.3382/ps.0632450.
Effects of sequential changes in dietary protein on growth from 0 to 20 weeks of age and on egg production from 20 to 72 weeks of age were evaluated with White Leghorn chickens. Four dietary treatments were compared. They consisted of three dietary regimens wherein an 18% crude protein (CP) diet was fed to 1, 2, or 3 weeks of age (Treatments 1, 2, and 3, respectively) and then common 12, 15, and 18% CP diets to 8, 14, and 20 weeks, respectively. These three regimens were compared with a control regimen (Treatment 4) that consisted of feeding 18, 15, and 12% CP diets to 6, 14, and 20 weeks of age, respectively. At 20 weeks of age, 144 birds from each treatment were moved into laying cages for the subsequent 52 weeks of egg production. In comparison with birds on the control feeding regimen, those reared under Treatments 1, 2, and 3 consumed significantly less feed during the 20-week growing period. Birds of Treatments 2 and 3 consumed significantly more protein than those of Treatments 1 and 4. By feeding a 12% CP diet from 1, 2, and 3 to 8 weeks of age, body weights were significantly lower than the average body weight of the control birds, approximately 20, 17, and 13%, respectively, by 6 weeks of age, but only 2 to 4% at 16 weeks of age, and by nonsignificant amounts at 28 weeks of age. Treatment 1 birds consumed 1.8% (significantly) less feed per unit body weight and were 2.6% (significantly) lighter at 20 weeks of age compared with the control birds.(ABSTRACT TRUNCATED AT 250 WORDS)
用白来航鸡评估了日粮蛋白质的连续变化对0至20周龄生长以及20至72周龄产蛋性能的影响。比较了四种日粮处理方式。其中三种日粮方案是分别在1、2或3周龄时饲喂18%粗蛋白（CP）日粮（分别为处理1、2和3），然后在8、14和20周龄时分别饲喂常规的12%、15%和18%CP日粮。将这三种方案与对照方案（处理4）进行比较，对照方案是分别在6、14和20周龄时饲喂18%、15%和12%CP日粮。在20周龄时，将每种处理的144只鸡转移到产蛋笼中，进行随后52周的产蛋期试验。与采用对照饲喂方案的鸡相比，采用处理1、2和3饲养的鸡在20周的生长期内消耗的饲料显著减少。处理2和3的鸡比处理1和4的鸡消耗的蛋白质显著更多。从1、2和3周龄到8周龄饲喂12%CP日粮，6周龄时体重显著低于对照鸡的平均体重，分别约低20%、17%和13%，但16周龄时仅低2%至4%，28周龄时差异不显著。与对照鸡相比，处理1的鸡在20周龄时每单位体重消耗的饲料少1.8%（显著），体重轻2.6%（显著）。（摘要截选至250字）
