Cunningham D L, Polte S J
Poult Sci. 1984 Jan;63(1):38-44. doi: 10.3382/ps.0630038.
Four feeding programs were conducted to evaluate the effects of feed restriction initiated at different stages of production on performance and economic returns of White Leghorn layers. Program 1 consisted of full feeding from 20 weeks of age. Feeding Programs 2, 3, and 4 consisted of feeding 105 g/bird/day starting at 28, 38, and 45 weeks of age, respectively. Information on production performance and egg grade distributions were collected and used to compare egg returns over feed costs for feed costs of 140, 160, and $180/ton and egg prices of 52, 50, 48 and 26 cents for extra-large, large, medium, and small sizes of eggs. Prices for mediums varied from -2 to -8 cents under large. Early feed restriction (Program 2) resulted in reduced egg production, feed usage, body weights, and average egg weights. Restriction from 38 and 45 weeks (Programs 3 and 4) resulted in levels of egg production comparable to the full-fed hens. Significantly (P less than .05) less feed was used, smaller body weights and egg weights were obtained, and more medium grade eggs were produced with Programs 3 and 4. Egg incomes over feed costs were greatest for the restriction programs initiated from 38 and 45 weeks of age.
开展了四项饲养方案，以评估在蛋鸡生产的不同阶段开始实施限饲对白来航蛋鸡生产性能和经济效益的影响。方案1为从20周龄开始全程充分饲喂。方案2、3和4分别从28、38和45周龄开始，每只鸡每天饲喂105克。收集了生产性能和鸡蛋等级分布的信息，用于比较饲料成本为每吨140美元、160美元和180美元，特大号、大号、中号和小号鸡蛋价格分别为52美分、50美分、48美分和26美分时的鸡蛋收益与饲料成本。中号鸡蛋价格比大号鸡蛋低2至8美分。早期限饲（方案2）导致产蛋量、饲料消耗量、体重和平均蛋重下降。38周龄和45周龄开始限饲（方案3和4）时，产蛋量水平与全程充分饲喂的母鸡相当。方案3和4的饲料使用量显著减少（P小于0.05），体重和蛋重较小，中等级鸡蛋产量更高。从38周龄和45周龄开始实施的限饲方案，其鸡蛋收益超过饲料成本的幅度最大。
