This study was to assess the impact of permanent or temporary restricted feeding on laying hen production traits, physiology, and egg quality. Two hundred and forty individually housed ISA Brown hens were monitored across 2 phases, assigned to 3 treatments: ad libitum feeding (ALF), temporary restricted feeding (TRF) and permanent restricted feeding (PRF), n = 80 hens per treatment. In Phase 1 (P1), 22 to 40 weeks, the TRF and PRF hens were offered 115 g of feed daily. In Phase 2 (P2), 41 to 46 weeks, the TRF hens were transitioned to ALF status while the ALF and PRF hens remained as in P1. From 35 to 40 weeks, eggs were collected once weekly from 15 hens per treatment and assessed for differences in albumen, yolk, and shell variables. At 45 weeks, 10 hens each from the ALF and PRF groups were euthanized and differences in organ characteristics were assessed. In P1, feed intake, feed to egg conversion ratio and body weight (BW) change were lower (P < 0.01), while albumen height and Haugh unit were higher (P < 0.01) in both PRF and TRF hen treatments compared to hens allocated the ALF treatment. In P2, TRF and ALF hens had a higher egg production and egg mass than PRF (P < 0.01) than ALF. Body weight change in P2 was higher in TRF and similar in both ALF and PRF, while feed intake and feed conversion ratio were higher in TRF followed by ALF and least in the PRF treatment group (P < 0.01). At 45 weeks ALF hens had a greater abdominal fat pad weight and fatty liver haemorrhagic syndrome lesion score compared to PRF. Restricting hens to 115 g of feed per day from point of lay restrained BW, improved feed conversion ratio and albumen quality and reduced abdominal fat pad deposition and clinical signs of fatty liver haemorrhagic syndrome in individually housed laying hens.

本研究旨在评估永久或暂时限制饲喂对蛋鸡生产性状、生理学和鸡蛋质量的影响。对 240 只单独饲养的 ISA Brown 母鸡进行了 2 个阶段的监测，分配到 3 个处理组：随意饲喂 (ALF)、临时限制饲喂 (TRF) 和永久限制饲喂 (PRF)，n = 每次处理 80 只母鸡。在第 1 阶段 (P1)，即 22 至 40 周，每天为 TRF 和 PRF 母鸡提供 115 克饲料。在第 2 阶段 (P2)，即 41 至 46 周，TRF 母鸡转变为 ALF 状态，而 ALF 和 PRF 母鸡仍保持 P1 状态。从 35 周到 40 周，每周从每次处理的 15 只母鸡中收集一次鸡蛋，并评估蛋白、蛋黄和蛋壳变量的差异。45 周时，ALF 组和 PRF 组各 10 只母鸡被安乐死，并评估器官特征的差异。P1 阶段，采食量、料蛋转化率和体重（BW）变化较低（P  < 0.01），而蛋白高度和哈夫单位较高（P < 0.01) 在 PRF 和 TRF 母鸡处理中与分配 ALF 处理的母鸡相比。在 P2 中，TRF 和 ALF 母鸡的产蛋量和蛋质量均高于 PRF（P  < 0.01），高于 ALF。P2 组体重变化在 TRF 中较高，在 ALF 和 PRF 中相似，而采食量和饲料转化率在 TRF 中较高，其次是 ALF，在 PRF 处理组中最低（P < 0.01 ）  。45 周时，与 PRF 相比，ALF 母鸡的腹部脂肪垫重量和脂肪肝出血综合征病变评分更大。从产蛋点开始将母鸡每日采食量限制在 115 克，可抑制单独饲养的蛋鸡的体重，提高饲料转化率和蛋白质量，减少腹部脂肪垫沉积和脂肪肝出血综合征的临床症状。