Dietary Crude Protein Requirements for Fast-Growing Yellow-Feathered Broilers Aged from 1 to 21 Days

GOU Zhongyong, ZHOU Guilian, JIANG Zongyong, JIANG Shouqun, DING Fayuan, YU Deqian

doi:10.3969/j.issn.1006-267x.2014.09.011

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 9: 2513 - 2522

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.09.011

Poultry Nutrition

Dietary Crude Protein Requirements for Fast-Growing Yellow-Feathered Broilers Aged from 1 to 21 Days

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The Key Laboratory of Animal Nutrition and Feed Science (South China) of Ministry of Agriculture, Guangdong Public Laboratory of Animal Breeding and Nutrition, Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China

Received date: 2014-03-19

Online published: 2014-09-10

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Abstract

This experiment was conducted to investigate crude protein (CP) requirements for fast-growing yellow-feathered broilers aged from 1 to 21 days, and to provide reference data for nutrition research and commercial production of yellow-feathered chickens. A total of 1 500 fast-growing yellow-feathered broilers at 1 day of age were divided into 10 treatments with 3 replicates per treatment and 50 birds per replicate in a 2 (sex)×5 (CP level) experimental design. The CP levels were 18.0%, 19.5%, 21.0%, 22.5% and 24.0%, respectively. The experiment lasted for 21 days. The results showed as follows: when growth performance and protein deposition were the evaluation indexes, 21.0% CP was the best for both sexes; for carcass quality indices, the optimal CP requirements were 19.5% for females and 21.0% for males. However, these values changed to 21.0% and 22.5% respectively when regarding serum uric acid content as an index for evaluation. All the indices such as growth performance data were analyzed by regress model, and proper CP requirement ranged from 20.6% to 21.6%. On the basis of all evaluation criteria, CP requirement for both female and male yellow-feathered broilers aged from 1 to 21 days is 21.0%. The daily CP requirement for males is 6.04 g and for females is 5.52 g. CP requirement in diet is not affected by sex, but daily CP requirement is influenced by sex.

Key words： yellow-feathered broilers; crude protein; requirements

Cite this article

GOU Zhongyong, ZHOU Guilian, JIANG Zongyong, JIANG Shouqun, DING Fayuan, YU Deqian . Dietary Crude Protein Requirements for Fast-Growing Yellow-Feathered Broilers Aged from 1 to 21 Days[J]. Chinese Journal of Animal Nutrition, 2014 , 26(9) : 2513 -2522 . DOI: 10.3969/j.issn.1006-267x.2014.09.011

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