The current feeding study was designed to validate the two dietary essential amino acid profiles (EAAP) established based on linear broken-line (LBL) and quadratic broken-line (QBL) models, in a previous study, against Evonik (AMINOHen) and breeder recommendations for ISA Brown layers for peak production (PP, 20 to 44 weeks of age), and post peak production (post PP, 44 to 75 weeks of age). The EAAP based on LBL models on average had 19.5% and 26.0% lower digestible AA (Lys, Met + Cys, Thr, Trp, Ile and Val), than the EAAP based on QBL models for PP and post PP, respectively. The EAAP based on AMINOHen and breeder recommendation had lower digestible AA than QBL, and higher EAAP than LBL models for both production phases. At 20 weeks of age, 224 ISA Brown layer hens were weighed and randomly allocated to individual battery cages. Each of the four diets was replicated 8 times with 7 birds per replicate. Egg production was recorded daily, and egg weights were measured at the end of each week. Feed consumption was measured at the end of each period. The egg production rate was not significantly affected by the diets and remained at around 98.0% (PP) and 95.0% (post PP) ( > 0.05). Birds fed diets based on LBL recommendation consistently laid smaller eggs, resulting in a lower egg mass (59.8 vs. 62.0 g egg/hen per day during PP, and 60.3 vs. 63.0 g egg/hen per day during post PP; < 0.05). Diets had no significant effect on feed intake and body weight ( > 0.05). The highest feed conversion ratio (FCR) during PP ( = 0.067) and post PP ( < 0.05) was recorded for the birds offered diets based on LBL recommendation. In conclusion, all four EAAP tested in this study support an above average egg production rate. However, the EAAP based on LBL models may potentially decrease the input feed cost per kilogram of eggs but are not set to optimise FCR and maximise egg mass.

中文翻译：

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评估 ISA 褐蛋鸡推荐的四种不同日粮氨基酸谱：一项验证研究


当前的喂养研究旨在验证基于线性折线（LBL）和二次折线（QBL）模型建立的两种膳食必需氨基酸谱（EAAP），在先前的研究中，针对赢创（AMINOhen）和饲养员针对 ISA 褐蛋鸡的高峰生产（PP，20 至 44 周龄）和高峰后生产（PP 后，44 至 75 周龄）的建议。对于 PP 和后 PP，基于 LBL 模型的 EAAP 的可消化 AA（Lys、Met + Cys、Thr、Trp、Ile 和 Val）平均分别比基于 QBL 模型的 EAAP 低 19.5% 和 26.0%。基于 AMINOHen 和育种者推荐的 EAAP 在两个生产阶段的可消化 AA 均低于 QBL，而 EAAP 高于 LBL 模型。在 20 周龄时，对 224 只 ISA 褐蛋鸡进行称重并随机分配到单独的笼舍中。四种饮食均重复 8 次，每次重复 7 只鸡。每天记录产蛋量，并在每周结束时测量蛋重。在每个时期结束时测量饲料消耗量。产蛋率并未受到日粮的显着影响，保持在 98.0%（PP）和 95.0%（PP 后）左右（> 0.05）。根据 LBL 建议饲喂日粮的禽类始终产下较小的鸡蛋，导致蛋量较低（PP 期间每天每只鸡蛋 59.8 克与 62.0 克，PP 后每天每只鸡蛋 60.3 克与 63.0 克；< 0.05） 。日粮对采食量和体重没有显着影响（> 0.05）。根据 LBL 建议提供的日粮，记录了 PP 期间 (= 0.067) 和 PP 后 (< 0.05) 的最高饲料转化率 (FCR)。总之，本研究中测试的所有四种 EAAP 均支持高于平均水平的产蛋率。 然而，基于 LBL 模型的 EAAP 可能会降低每公斤鸡蛋的投入饲料成本，但无法优化 FCR 并最大化鸡蛋质量。