Study of Energy Requirement of Guizhou Yellow Chicken during 0 to 6 Weeks of Age

YANG Defeng; SHI Xiaoli; LI Wei; RAO Yongchao; CHEN Dahai; LU Longchao; WANG Xiaoya; LIN Jiadong; ZHANG Fuping

doi:10.3969/j.issn.1006-267x.2022.04.032

Chinese Journal of Animal Nutrition >

2022 , Vol. 34 >Issue 4: 2374 - 2382

DOI: https://doi.org/10.3969/j.issn.1006-267x.2022.04.032

Study of Energy Requirement of Guizhou Yellow Chicken during 0 to 6 Weeks of Age

YANG Defeng ,
SHI Xiaoli ,
LI Wei ,
RAO Yongchao ,
CHEN Dahai ,
LU Longchao ,
WANG Xiaoya ,
LIN Jiadong ,
ZHANG Fuping

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1. Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region, Ministry of Education, Guizhou University, Guiyang 550025, China;
2. Guizhou Provincial Key Laboratory of Animal Genetics, Breeding and Reproduction, Guizhou University, Guiyang 550025, China;
3. College of Animal Science, Guizhou University, Guiyang 550025, China;
4. Guizhou Province Animal and Poultry Genetic Resources Management Station, Guiyang 550001, China

Received date: 2021-09-11

Online published: 2022-04-14

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Abstract

This experiment was conducted to study the energy requirement of Guizhou yellow chicken during 0 to 6 weeks of age, in order to provide theoretical basis and data reference for the scientific breeding of Guizhou yellow chickens and the formulation of feeding standards. A total of 400 healthy 1-day-old Guizhou yellow chicken chicks were selected in a single-factor completely randomized trial design and randomly divided into 4 groups with 5 repetitions of 20 chicks each. The dietary energy levels of 4 groups were 10.03, 11.71, 12.54 and 13.16 MJ/kg, respectively. The trial period was 6 weeks. The weekly body weight and feed intake of Guizhou yellow chickens were measured, and the average daily gain, average daily feed intake and feed-to-gain ratio were calculated. The apparent metabolic energy and nutrient apparent metabolizabilities were measured by metabolic test, and the physical energy, crude protein and ether extract contents of Guizhou yellow chickens were measured by comparing slaughter test, and the physical energy, protein and fat deposition rate of chickens were calculated to determine the appropriate dietary energy level. The results showed the dietary energy level had significant effects on the average daily gain, average daily feed intake and feed-to-gain ratio of Guizhou yellow chicken during 0 to 6 weeks of age (P<0.05). On the average daily gain of binary regression analysis to get the optimum dietary energy level was 11.17 MJ/kg. Dietary energy level had significant effects on the apparent metabolizabilities of nutrients of Guizhou yellow chicken during 0 to 6 weeks of age (P<0.05), and appropriate increase in dietary energy level could improve the apparent metabolizabilities of each nutrient and thus improve feed utilization. As a judge index, the recommended dietary energy level of Guizhou yellow chicken during 0 to 6 weeks of age was 12.54 MJ/kg. Dietary energy level had significant effects on the intake and deposition rates of energy, crude protein and ether extract of Guizhou yellow chicken during 0 to 6 weeks of age (P<0.05). The appropriate dietary energy level would increase the deposition rates of the three nutrients, as a judge index, the recommended dietary energy level of Guizhou yellow chicken during 0 to 6 weeks of age was 12.54 MJ/kg. The predicted model of energy requirement of Guizhou yellow chicken during 0 to 6 weeks of age established by regression analysis is AME_G=377.70+1.606 9NE_G (R²=0.759 1; in this formula, AME_G represents apparent metabolic energy for gain, and NE_G represents net energy for gain), and the maintenance apparent metabolic energy requirement per kg of metabolic body weight is 377.70 kJ, and its conversion rate of net energy for gain of apparent metabolic energy for gain is 62.23%.

Key words： Guizhou yellow chicken; energy level; energy requirement; energy mode

Cite this article

YANG Defeng , SHI Xiaoli , LI Wei , RAO Yongchao , CHEN Dahai , LU Longchao , WANG Xiaoya , LIN Jiadong , ZHANG Fuping . Study of Energy Requirement of Guizhou Yellow Chicken during 0 to 6 Weeks of Age[J]. Chinese Journal of Animal Nutrition, 2022 , 34(4) : 2374 -2382 . DOI: 10.3969/j.issn.1006-267x.2022.04.032

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