Effects of a Rearing Dietary Protein Regimen on Productive Performance, Egg Quality, and Bone Quality of Laying Hens.

IF 1.8 4区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE Journal of Poultry Science Pub Date : 2022-10-25 DOI:10.2141/jpsa.0220042
Cecilia T Oluwabiyi, Jingpeng Zhao, Hongchao Jiao, Xiaojuan Wang, Haifang Li, Yunlei Zhou, Hai Lin
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Abstract

The pullet phase is an important stage in the development of laying hens when the development of organs, including reproductive organs and bones, is rapid. However, in recent years, few studies have focused on this crucial stage. The purpose of this study was to evaluate the effect of a dietary crude protein (CP) regimen during the rearing period (9-21 weeks (wks) of age) on pullet development and the subsequent performance, egg quality, and bone quality of Hy-Line Brown laying hens. A total of 256 pullets were randomly assigned to two treatments. Each treatment was replicated eight times with 16 pullets per replicate (n=8), which were fed ad libitum using either of the two CP regimens: (1) 14%-18% CP (fed with 14% and 18% CP from 9-17 wks and 18-21 wks, respectively); (2) 16% CP (fed with 16% CP from 9-21 wks of age). At 21 wks of age, eight birds per treatment were randomly selected to evaluate body composition and ovarian development. For quality analysis, eggs were collected at 28, 32, 36, and 70 wks. At 70 wks of age, eight hens per treatment were selected to evaluate bone quality. There were no treatment differences in pullet performance, body composition, and ovarian development at 21 wks. The dietary CP regimen during the rearing period (9-21 wks) did not influence laying performance during the laying period. There were no treatment differences in tibial and femoral quality at 70 wks. Egg quality results showed an inconsistent trend. It was concluded that the pullets fed with the low CP grower diet (14%) during the pullet period and a high CP pre-lay diet (18%) from 18-21 wks of age developed properly and had satisfactory laying performance. However, the rearing diet did not enhance bone quality.

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饲粮蛋白质方案对蛋鸡生产性能、蛋品质和骨品质的影响。
小鸡期是蛋鸡发育的一个重要阶段,包括生殖器官和骨骼在内的器官发育迅速。然而,近年来,很少有研究关注这一关键阶段。本试验旨在评价饲养期(9 ~ 21周龄)饲粮粗蛋白质(CP)方案对海兰褐蛋鸡幼雏发育及后续生产性能、蛋品质和骨品质的影响。共有256只幼崽被随机分为两组。每个处理重复8次,每个重复16只仔鸡(n=8),使用两种CP方案任意饲喂:(1)14% ~ 18% CP(分别于9-17周和18-21周饲喂14%和18% CP);(2) 16% CP(9 ~ 21周龄饲喂16% CP)。在21周龄时,每个处理随机选择8只鸡,评估其身体组成和卵巢发育情况。在28、32、36和70周采集卵子进行质量分析。70周龄时,每组8只鸡进行骨质量评价。在第21周时,各组在小鸡性能、体成分和卵巢发育方面没有差异。饲养期(9 ~ 21周)饲粮CP方案对产蛋期产蛋率无显著影响。在70周时,胫骨和股骨质量没有治疗差异。鸡蛋品质结果呈现出不一致的趋势。综上所述,在产蛋期饲喂低CP生长饲粮(14%)和18 ~ 21周龄饲喂高CP产蛋前饲粮(18%)的蛋鸡发育正常,产蛋性能满意。然而,饲养饲粮没有提高骨质量。
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来源期刊
Journal of Poultry Science
Journal of Poultry Science AGRICULTURE, DAIRY & ANIMAL SCIENCE-
CiteScore
2.80
自引率
13.30%
发文量
26
审稿时长
12 months
期刊介绍: The Journal of Poultry Science will publish original reports and reviews which either make an original contribution to fundamental science or are of obvious application to the industry. Subjects which are covered include: breeding and genetics, nutrition and feeds, physiology, reproduction, immunology, behavior, environmental science, management and housing welfare, processing and products, and health in poultry. Submission of original articles to the Journal is open to all poultry researchers. The review articles are invited papers written by international outstanding researchers. Articles will be published in English, American style.
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