Effect of dietary energy concentration on the growth of slow-growing Korat chickens from 43 to 84 days old

IF 0.7 4区农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE

South African Journal of Animal Science Pub Date : 2022-05-10 DOI:10.4314/sajas.v52i1.3

P. Maliwan, S. Okrathok, C. Pukkung, P. Pasri, S. Khempaka

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Abstract

The aim of this study was to estimate the effect of diets with different energy levels on the growth performance of slow-growing chickens (so-called Korat chicken (KRC)). The KRC is a cross between a male Thai native chicken (Leung Hang Khoa) and females from crosses among modern broiler and layer lines. The study was divided into two experimental periods when the birds were from 43 to 63 days old and 64 to 84 days old. Birds received feed and water ad libitum throughout the trial. In this study, 1200 mixed-sex KRC(624 and 576 chicks in phases 1 and 2, respectively) were distributed equally to four diets, which provided 2750, 2900, 3050 and 3200 kcal ME/kg. There were six replicate pens of each treatment. At both ages,increased energy content of the diet resulted in decreased feed intake (FI) and thus improved the feed conversion ratio (FCR). Weight gain was unaffected by the treatments. Using a broken-line analysis, dietary energy containing about 3200 kcal ME/kg was found to have the most beneficial effect on FCR during both periods. Thus, the optimal ME for KRC between 43 and 84 days old was 3200 kcal/kg.

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饲粮能量浓度对43 ~ 84日龄慢生长Korat鸡生长的影响

本试验旨在研究不同能量水平饲粮对慢生长鸡(Korat chicken, KRC)生长性能的影响。KRC是雄性泰国土鸡(Leung Hang Khoa)与现代肉鸡和蛋鸡杂交的雌性杂交品种。这项研究分为两个实验阶段，分别是43 - 63天龄和64 - 84天龄。在整个试验过程中，鸟类可以随意获得饲料和水。试验选用1200只雌雄混合的KRC(一期624只，二期576只)，平均分配到4种饲粮中，分别提供2750、2900、3050和3200千卡代谢能/kg。每个处理有6支重复笔。在两个日龄，饲粮能量含量的增加导致采食量(FI)的降低，从而提高了饲料系数(FCR)。体重增加没有受到治疗的影响。通过折线分析，发现在这两个时期，含有约3200 kcal ME/kg的日粮能量对FCR的影响最大。因此，43 ~ 84日龄KRC的最佳代谢能为3200千卡/kg。

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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来源期刊

South African Journal of Animal Science 农林科学-奶制品与动物科学

CiteScore

1.50

自引率

0.00%

发文量

审稿时长

>36 weeks

期刊介绍： The South African Journal of Animal Science is an open access, peer-reviewed journal for publication of original scientific articles and reviews in the field of animal science. The journal publishes reports of research dealing with production of farmed animal species (cattle, sheep, goats, pigs, horses, poultry and ostriches), as well as pertinent aspects of research on aquatic and wildlife species. Disciplines covered nutrition, genetics, physiology, and production systems. Systematic research on animal products, behaviour, and welfare are also invited. Rigorous testing of well-specified hypotheses is expected.