Dietary lysine and apparent nitrogen-corrected metabolizable energy (AMEn) are two key variables affecting the production of breeder hens. In this study, the effects and interactions of lysine and AMEn on yellow-feathered broiler breeder hens were investigated. A total of 720 30-week-old breeder hens were fed in a 5 (lysine: 0.56%, 0.68%, 0.80%, 0.92%, and 1.04%) × 2 (AMEn: 11.50 and 11.10 MJ/kg) factorial arrangement for 12 weeks. The productive performance, reproductive traits, biochemical variables of breeder hens, the amino acid concentration and quality of eggs, and the growth performance of offspring broilers were determined. (1) Dietary lysine had quadratic effects (P < 0.05) on laying rate, average daily egg mass and feed intake/egg mass of breeder hens; birds with 11.50 MJ/kg AMEn (high AMEn) had higher (P < 0.05) BW than those with 11.10 MJ/kg AMEn (low AMEn); (2) dietary lysine significantly affected on the relative ovarian weight (quadratic and linear), and numbers of large yellow follicles (LYF, quadratic); birds with high AMEn had longer fallopian tube and more LYF than those with low AMEn (P < 0.05); (3) dietary lysine had significant effects (linear and quadratic) on eggshell thickness and shell strength of eggs from breeder hens; birds with high AMEn had thinner eggshells and deeper yolk color than those with low AMEn (P < 0.05); (4) there were higher (P < 0.05) contents of protein and concentrations of all measured animo acids (AAs) in eggs from birds fed low AMEn; (5) supplementation with high AMEn to breeder hens significantly increased the hatchability of fertilized eggs; (6) neither dietary lysine level or AMEn affected growth performance of offspring broilers; (7) both dietary lysine level and AMEn significantly affected gonadotropin concentrations and biochemical variables of breeder hens. Dietary lysine had significant influences on productive performance, reproductive traits, and egg quality of yellow-feathered breeder hens. Based on productive performance, the optimal levels of dietary lysine were 0.81% to 0.83%, while 0.71% to 72% lysine was enough to obtain the best quality of breeding eggs. High AMEn was more beneficial to breeder hens for reproductive traits and hatchability of the fertilized eggs, while it showed detrimental effects on eggshell thickness and AA concentrations of breeding eggs.

中文翻译：

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日粮赖氨酸与表观氮校正代谢能量对黄羽肉种鸡的影响及交互作用


日粮赖氨酸和表观氮校正代谢能 （AMEn） 是影响种鸡产量的两个关键变量。在本研究中，研究了赖氨酸和 AMEn 对黄羽肉种鸡的影响和相互作用。共有 720 只 30 周龄种鸡以 5 种 （赖氨酸： 0.56%、0.68%、0.80%、0.92% 和 1.04%） × 2 种 （AMEn： 11.50 和 11.10 MJ/kg） 因子安排饲喂 12 周。测定种鸡的生产性能、繁殖性状、生化变量、种蛋氨基酸浓度和品质以及后代肉鸡的生长性能。（1） 日粮赖氨酸对种鸡产蛋率、平均日产蛋量和采食量/蛋质量有二次效应 （P < 0.05）;AMEn 为 11.50 MJ/kg 的鸡 （高 AMEn） 的鸡体重高于 （P < 0.05） 的鸡 （低 AMEn）;（2） 膳食赖氨酸对相对卵巢重量 （二次型和线性） 和黄色大卵泡数量 （LYF， 二次型） 有显著影响;AMEn 高的鸟类比 AMEn 低的鸟类输卵管更长，LYF 更高 （P < 0.05）;（3） 日粮赖氨酸对种鸡蛋壳厚度和蛋壳强度有显著影响 （线性和二次型）;AMEn 高的鸡比 AMEn 低的鸡蛋壳更薄，蛋黄颜色更深 （P < 0.05）;（4） 有更高的 （P < 0.05） 低 AMEn 饲喂家禽蛋中蛋白质含量和所有测得的无离子酸 （AAs） 浓度;（5） 给种鸡补充高 AMEn 显著提高了受精蛋的孵化率;（6） 日粮赖氨酸水平或 AMEn 均不影响后代肉鸡的生长性能;（7） 日粮赖氨酸水平和 AMEn 均显著影响种鸡的促性腺激素浓度和生化指标。日粮赖氨酸对黄羽种鸡的生产性能、繁殖性状和蛋品质有显著影响。根据生产性能，日粮赖氨酸的最佳水平为 0.81% 至 0.83%，而 0.71% 至 72% 赖氨酸足以获得最佳质量的种蛋。高 AMEn 对种鸡的繁殖特性和受精蛋的孵化率更有利，而对种蛋的蛋壳厚度和 AA 浓度有不利影响。