评估柯布 700 基因型在生长过程中体内的钙和磷组成。

IF 1.6 3区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE British Poultry Science Pub Date : 2024-10-09 DOI:10.1080/00071668.2024.2394976
F Salisbury, R M Gous, A J Cowieson, C Jansen Van Rensburg, S J Rochell, H Walters
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引用次数: 0

摘要

1.2. 采用四阶段自由采食方案饲喂 400 只雌雄雏鸡。饲料中的钙和磷含量达到或超过了能量、蛋白质和氨基酸的要求。所有雏鸡每周称重一次。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。3. 105 d 雄禽和雌禽的钙含量平均分别为 54 克和 37 克,105 d 雄禽和雌禽的磷含量平均分别为 35 克和 27 克。评估了灰分、钙和磷与无羽毛的空体蛋白质的异构关系。灰分与体内蛋白质呈等计量关系,而钙和磷与体内蛋白质的等计量指数大于 1。 将钙和磷相对于体内蛋白质的等计量模型和平均值与文献中的模型和平均值进行了比较。将钙/蛋白质比率与以前的数据进行比较后发现,现代肉鸡即使最大限度地提高生长速度,也可能达不到现行日粮指南规定的潜在骨矿物质沉积量。 现在已经提出了骨和无骨体中的钙和磷与体蛋白质之间的理论等量关系。钙和磷与无骨、无羽毛的机体蛋白质之间的等量关系为这些矿物质在肉鸡体内的生长提供了一个合适的模型。
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Evaluation of body calcium and phosphorus composition of the Cobb 700 genotype during growth.

1. The amount of calcium and phosphorus in the empty, feather-free bodies of Cobb 700 breed males and females was measured from hatch to 15 weeks of age.2. A four-phase ad libitum feeding programme was used to feed 400 chicks of each sex. Feeds contained commercial levels of calcium and phosphorus which met or exceeded the requirements for energy, protein and amino acids. 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. Defeathered birds were minced, freeze-dried and then analysed for protein, ash, calcium and phosphorus content.3. Amounts of Ca in males and females at 105 d averaged 54 and 37 g, respectively, and 105 d P content in males and females averaged 35 and 27 g, respectively. The allometry of ash, Ca and P with empty, feather-free body protein was assessed. Ash was isometric with body protein, while an allometric exponent greater than 1 was established for Ca and P with body protein.4. The allometric models and means for Ca and P relative to body protein were compared with models and means found in the literature. Comparison of the Ca/protein ratios with previous data suggested that modern broilers may not reach their potential bone mineral deposition with current dietary guidelines, even when growth rates were maximised.5. Theoretical allometric relationships between Ca and P in bone and bone-free body and body protein have now been proposed. The allometric relationship between Ca and P and empty, feather-free body protein offers a suitable way to model the growth of these minerals in the broiler body.

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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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