Feeding broiler breeders to satiety has negative consequences on their health and reproduction. Alternative feeding strategies during rearing can improve welfare, although their implications during lay are not well understood. The objective was to examine the effect of rearing feeding treatments on the reproductive performance and feeding behavior of broiler breeders under simulated commercial conditions. At 3 wk of age, 1,680 Ross 308 pullets were allocated to 24 pens under 1 of 4 isocaloric treatments: 1) daily control diet; 2) daily alternative diet (40% soybean hulls and 1 to 5% calcium propionate); 3) 4/3 control diet (4 on-feed days, 3 non-consecutive off-feed days per week); and 4) graduated control diet. Feeding frequency of the graduated treatment varied with age and finished on a daily basis. At 23 wk of age, group sizes were adjusted to 40 hens, and 5 mature Yield Plus Males roosters were introduced to each pen. Pens were under the same daily feeding management and same diet during lay. The performance of broiler breeders (growth rate, body weight uniformity, and reproductive performance) was determined until 64 wk of age. At the end of lay, feeding motivation was examined with a feed intake test and a compensatory feeding test. Data were analyzed using linear mixed regression models, with pen nested in the models and age as a repeated measure. The laying rate of hens reared on the graduated treatment decreased slower compared to control hens, resulting in a higher cumulative egg production (178.2 ± 3.8 eggs/hen) than control hens (165.2 ± 3.8 eggs/hen, P < 0.01) by 64 wk of age. Hens reared on non-daily feeding treatments laid lighter eggs with relatively heavier yolks and had higher feed intake at the end of lay than hens fed daily during rearing (P = 0.02). In conclusion, rearing feeding treatments impacted the growth rate and body weight uniformity during lay, feeding motivation at the end of lay, and the laying rate and hatchability depending on hens' age.

中文翻译：

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肉种鸡替代饲养策略的影响： 2. 产蛋期间的福利和生产性能。

肉种鸡吃饱会对它们的健康和繁殖产生负面影响。饲养期间的替代喂养策略可以改善福利，尽管其在产蛋期间的影响尚不清楚。目的是研究模拟商业条件下饲养饲养处理对肉种鸡繁殖性能和饲养行为的影响。3 周龄时，1,680 只 Ross 308 小母鸡被分配到 24 个栏，接受 4 种等热量处理中的一种：1) 每日控制饮食；2)每日替代饮食(40%大豆皮和1～5%丙酸钙)；3）4/3对照日粮（每周4天喂食，3天不连续停食）；4）分级控制饮食。分级治疗的喂养频率随年龄而变化，每天完成一次。23周龄时，将群体规模调整为40只母鸡，并将5只成熟的产量加雄性公鸡引入每个围栏。围栏的日常饲养管理和产蛋期间的饮食相同。肉种鸡的性能（生长率、体重均匀度和繁殖性能）一直持续到 64 周龄。产蛋结束时，通过采食量测试和补偿性饲喂测试来检查饲喂动机。使用线性混合回归模型分析数据，其中笔嵌套在模型中，年龄作为重复测量。与对照母鸡相比，分级处理饲养的母鸡产蛋率下降较慢，导致 64 周时累积产蛋量（178.2 ± 3.8 蛋/母鸡）高于对照母鸡（165.2 ± 3.8 蛋/母鸡，P < 0.01）年龄。采用非每日饲喂处理饲养的母鸡产下的鸡蛋较轻，蛋黄相对较重，并且产蛋结束时的采食量高于饲养过程中每日饲喂的母鸡（P = 0.02）。总之，饲养饲喂处理会影响产蛋期间的生长速度和体重均匀性、产蛋结束时的饲喂动机以及取决于母鸡日龄的产蛋率和孵化率。