Crude Protein Requirement of Luxi Game Chickens during Laying Period

JIANG Shuzhen; CHEN Guanjun; YANG Weiren; YANG Zaibin; GAO Xiang; ZHANG Xianglun; KONG Lei

doi:10.3969/j.issn.1006-267x.2013.12.012

Chinese Journal of Animal Nutrition >

2013 , Vol. 25 >Issue 12: 2865 - 2872

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.12.012

Poultry Nutrition

Crude Protein Requirement of Luxi Game Chickens during Laying Period

JIANG Shuzhen ,
CHEN Guanjun ,
YANG Weiren ,
YANG Zaibin ,
GAO Xiang ,
ZHANG Xianglun ,
KONG Lei

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1. College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China;
2. Chinese Game Chickens Breeding Farm, Heze 274600, China;
3. Shandong Province Animal Husbandry and Veterinary Information Center, Jinan 250022, China

Received date: 2013-06-03

Online published: 2013-11-19

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Abstract

A single factor design was used in this 16 weeks experiment to study crude protein (CP) requirement of Luxi game chickens during laying period (aged 26 to 41 weeks). Rearing and slaughter experiments were conducted to study the effects of dietary CP level on production performance, body composition of Luxi game chickens during laying period and egg composition. A total of 200 26-week-old Luxi game chickens with the average body weight of (1.952±0.288) kg were randomly divided into 4 groups with 5 replicates per group and 10 hens per replicate. Four dietary CP levels were 14.00%, 15.50%, 17.00% and 18.50%,respectively. All birds were fed the same amount of diets. The results showed as follows: 1) 3 stages had been divided by means of production performance. From 26 to 29 weeks of age, dietary CP level did not affect laying rate, average daily egg mass(ADEM), the ratio of feed to egg and average egg weight of Luxi game chickens (P>0.05); from 30 to 37 weeks of age, laying rate of 17.00% group were higher than those of other groups (P<0.05), from 38 to 41 weeks of age, the ratio of feed to egg linearly decreased (P<0.05) and laying rate and ADEM linearly or quadratically increased (P<0.05) as the CP level increased from 14.00% to 18.50%. 2) Dietary CP level did not affect the contents of CP, ether extract( EE), ash, moisture and gross energy( GE) of chicken bodies and eggs (P>0.05). 3) Average daily crude protein intake( ADCPI) was regarded as dependent variable, average daily gain( ADG) and ADEM were regarded as independent variable, then multiple linear regressions were made, and the results showed as follows, from 26 to 29 weeks of age, CPI=3.52ADG+0.35ADEM+2.18BW^0.75; from 30 to 37 weeks of age, CPI=4.02ADG+0.35ADEM+2.42BW^0.75; from 38 to 41 weeks of age, CPI=3.09ADG+0.53ADEM+2.10BW^0.75. Through integrated account of ADG, ADEM and BW^0.75 of the best production performance group, the dietary appropriate CP levels for Luxi game chickens during the early period (26 to 29 weeks of age), middle period (30 to 37 weeks of age), and late period (38 to 41 weeks) are 14.19%, 16.92% and 18.28%, respectively.

Key words： Luxi game chickens; crude protein; requirement

Cite this article

JIANG Shuzhen , CHEN Guanjun , YANG Weiren , YANG Zaibin , GAO Xiang , ZHANG Xianglun , KONG Lei . Crude Protein Requirement of Luxi Game Chickens during Laying Period[J]. Chinese Journal of Animal Nutrition, 2013 , 25(12) : 2865 -2872 . DOI: 10.3969/j.issn.1006-267x.2013.12.012

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