Individual egg production of Hy-Line Brown hens during the early laying phase in response to dietary CP levels

E.H. Cabezas-Garcia, D.E. Rodríguez-Aguilar, G. Afanador-Téllez
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引用次数: 1

Abstract

The aim of this study was to investigate the effects of gradually increased dietary CP level on the dynamics of individual egg production of laying hens from 18 to 54 weeks of age. Forty Hy-Line Brown hens were divided into five treatments of eight replicates each and were fed diets formulated to have five different CP concentrations: 14, 15, 16, 17, and 18% CP with the same energy content. For each experimental diet, the contents of lysine, methionine + cysteine, threonine, and tryptophan were maintained at minimum requirement concentrations by supplying synthetic amino acids. Clutch characteristics were recorded (e.g., number, size, patterns, egg weight, etc.) and individual egg production curves were modeled according to Grossman and Koops (2001). Clutch size was defined as the unstopped length of individual egg production on a daily basis. BWs were also recorded every week to account for changes in BW during the experimental period. Three hens were excluded from the statistical analyses as their laying patterns were very inconsistent. Four clutch patterns with data weighted on a weekly basis were identified. Heavier hens tended to lay more regular clutch patterns when compared to their lighter counterparts within the same treatment. In contrast, irregular clutch patterns (too many pauses between clutches) were more common in hens fed low CP diets (≤16%). This could be explained by imbalances in amino acids supply according to their theoretical requirements and adverse effects caused by amino acids interactions. Low CP diets were able to maintain egg production and mean clutch size up to 54 weeks of age. The maximum clutch size and the modeled proportion of maximum production for the increasing phase (k1) displayed a linear response to the graded addition of CP content to the diet. No differences were detected among treatments for the age at the beginning of the maximum clutch (22.6 ± 2.82 weeks). Egg weight displayed a quadratic response that was maximized when hens were fed 17% CP in the diet. Our approach appears to be promising for ranking individual laying hens based on their clutch performance to evaluate both CP and amino acids adequacy of diets.

饲粮粗蛋白质水平对海兰褐鸡产蛋早期个体产蛋量的影响
本试验旨在研究逐渐提高饲粮粗蛋白质水平对18 ~ 54周龄蛋鸡单产蛋动态的影响。选取40只海兰褐鸡,分为5个处理,每个处理8个重复,分别饲喂CP浓度为14、15、16、17和18%、能量含量相同的饲粮。在各试验饲粮中,通过提供合成氨基酸,将赖氨酸、蛋氨酸+半胱氨酸、苏氨酸和色氨酸的含量维持在最低需求浓度。记录了卵群特征(如数量、大小、模式、蛋重等),并根据Grossman和Koops(2001)建立了个体产蛋曲线。卵数被定义为每天个体产蛋的未停止长度。每周记录体重,以反映试验期间体重的变化。有三只母鸡的产蛋模式非常不一致,因此被排除在统计分析之外。四个离合器模式与数据加权每周的基础上确定。在相同的条件下,与体重较轻的母鸡相比,体重较重的母鸡倾向于下更规律的蛋。相比之下,在低粗蛋白质饲粮(≤16%)的母鸡中,不规则的下蛋模式(下蛋之间停顿太多)更为常见。这可能是由于氨基酸按理论要求供应不平衡以及氨基酸相互作用造成的不利影响。低蛋白质饲粮能够维持产蛋量和平均窝蛋数至54周龄。饲粮中CP含量的逐级添加对育成期最大产仔数和模型最大产仔比例(k1)呈线性响应。各组最大产蛋年龄(22.6±2.82周)差异无统计学意义。蛋鸡的蛋重呈二次曲线,在饲粮中添加17%粗蛋白质时达到最大。我们的方法有望根据产蛋性能对蛋鸡进行排序,以评估饲粮的粗蛋白质和氨基酸充足性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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