Evaluation of the potential growth and body composition of the Cobb 700 genotype.

IF 1.6 3区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE British Poultry Science Pub Date : 2024-06-01 Epub Date: 2024-05-24 DOI:10.1080/00071668.2024.2328680
R M Gous, H Walters, S J Rochell, G C Emmans
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Abstract

1. The potential growth of the chemical and physical components of males and females of the Cobb 700 strain was measured from hatch to 15 weeks of age.2. A four-phase ad libitum feeding programme was used to feed 200 chicks of each sex. All birds were weighed weekly. Ten birds per sex were sampled at 0, 7, 14, 28, 42, 56, 70, 84 and 105 d of age. They were weighed before and after plucking to determine the weight of feathers. Physical parts were measured on defeathered birds, whereafter these components were combined, minced, freeze dried to measure water content, and then analysed for protein, lipid and ash content.3. Mature body weights of males and females averaged 8.38 and 6.94 kg, respectively, mature body protein weights averaged 1.48 and 1.19 kg and mature body lipid contents averaged 1.08 and 1.54 kg, respectively.4. Rates of maturing of the empty feather-free body weights of males and females averaged 0.0417 and 0.0402/d, respectively. All chemical and physical components within a sex, other than feathers, had the same rate of maturing. The rate of maturing of feathers, calculated by iteration, in males was lower than in females (0.0324 vs. 0.0357/d) and the mature weight was higher (435 vs. 372 g).5. The ratios of the chemical components to feather-free body protein at maturity for males and females were, for water, 3.80 and 3.34; for lipid, 0.73 and 1.29; and for ash, 0.13 and 0.19, respectively. Separate equations were required for males and females to describe the allometric relationship between lipid and protein in the feather-free body.6. Mature body weights of broilers in this trial were considerably higher than those measured using the same protocol 28 years ago, whereas rates of maturing have remained the same.

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评估柯布 700 基因型的生长潜力和身体组成。
1.2. 采用四阶段自由采食方案,每阶段饲喂 200 只雌雄雏鸡。所有雏鸟每周称重一次。在 0、7、14、28、42、56、70、84 和 105 日龄时,每种性别各抽取 10 只雏鸡。在拔毛前后称重,以确定羽毛的重量。测量羽毛的物理部分,然后将这些部分合并、剁碎、冷冻干燥以测量含水量,然后分析蛋白质、脂质和灰分含量。雄鸟和雌鸟的成熟体重平均分别为 8.38 千克和 6.94 千克,成熟体内蛋白质重量平均分别为 1.48 千克和 1.19 千克,成熟体内脂质含量平均分别为 1.08 千克和 1.54 千克。 雄鸟和雌鸟的空无羽体重成熟速度平均分别为 0.0417 和 0.0402/天。除羽毛外,性别内所有化学和物理成分的成熟率相同。通过迭代计算,雄性羽毛的成熟率低于雌性(0.0324 对 0.0357/d),成熟体重高于雌性(435 对 372 g)。 雄性和雌性羽毛成熟时的化学成分与无羽体蛋白质的比率分别为:水分 3.80 对 3.34;脂质 0.73 对 1.29;灰分 0.13 对 0.19。雄鸡和雌鸡需要使用不同的方程来描述无羽体脂质和蛋白质之间的异速关系。 6. 本次试验中肉鸡的成熟体重大大高于 28 年前使用相同方案测定的体重,而成熟率却保持不变。
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来源期刊
British Poultry Science
British Poultry Science 农林科学-奶制品与动物科学
CiteScore
3.90
自引率
5.00%
发文量
88
审稿时长
4.5 months
期刊介绍: From its first volume in 1960, British Poultry Science has been a leading international journal for poultry scientists and advisers to the poultry industry throughout the world. Over 60% of the independently refereed papers published originate outside the UK. Most typically they report the results of biological studies with an experimental approach which either make an original contribution to fundamental science or are of obvious application to the industry. Subjects which are covered include: anatomy, embryology, biochemistry, biophysics, physiology, reproduction and genetics, behaviour, microbiology, endocrinology, nutrition, environmental science, food science, feeding stuffs and feeding, management and housing welfare, breeding, hatching, poultry meat and egg yields and quality.Papers that adopt a modelling approach or describe the scientific background to new equipment or apparatus directly relevant to the industry are also published. The journal also features rapid publication of Short Communications. Summaries of papers presented at the Spring Meeting of the UK Branch of the WPSA are published in British Poultry Abstracts .
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