Study on Dietary Energy and Protein Requirements of Dawufen No.1 Commercial Layer Chicks Aged 5 to 9 Weeks

ZHANG Meng, LI Qiang, LIU Ping, XU Lijun, SU Kun, WANG Dehe, ZHOU Rongyan, CHEN Hui

doi:10.3969/j.issn.1006-267x.2018.07.013

Chinese Journal of Animal Nutrition >

2018 , Vol. 30 >Issue 7: 2529 - 2540

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.07.013

Molecular Nutrition

Study on Dietary Energy and Protein Requirements of Dawufen No.1 Commercial Layer Chicks Aged 5 to 9 Weeks

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1. College of Animal Science and Technology, Hebei Agricultural University, Baoding 071000, China;
2. College of Veterinary Medicine, Hebei Agricultural University, Baoding 071000, China;
3. Hebei Dawu Farming and Animal Husbandry Group, Baoding 071000, China;
4. Baoding Livestock Husbandry Workstation, Baoding 071000, China

Received date: 2017-12-07

Online published: 2018-07-20

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Abstract

Through setting up the regression models between dietary energy or protein levels and growth performance, serum biochemical indexes and organ indexes, the objective of this study was conducted to determine the dietary energy and protein requirements of Dawufen No.1 commercial layer chicks aged 5 to 9 weeks. Eight hundred and ten 28-day-old Dawufen No.1 commercial layer chicks with the same genetic background, similar body weight and good health were randomly divided into 9 groups with 6 replicates per group and 15 chicks per replicate. A 3×3 two-factor experiment design was adopted in this experiment. There were 9 diet were prepared, the energy level in the diet was 12.01, 12.51 and 13.01 MJ/kg, respectively, and the protein level in the diet was 19.81%, 20.81% and 21.81%, respectively. The experiment lasted for 35 days. The results showed as follows:1) with the increase of dietary energy level, the tibia length, chest breadth, keel length, serum triglyceride content of layer chicks aged 9 weeks were increased, while the average daily gain (ADG) of layer chicks aged 5 to 9 weeks was firstly decreased and then increased. 2) With the increase of dietary protein level, the body weight and chest breadth of layer chicks aged 9 weeks and the ADG of layer chicks aged 5 to 9 weeks were firstly increased and then decreased. 3) The interaction between energy and protein levels re had significant effects on the chest breadth, keel length and serum triglyceride content (P<0.05). 4) According to quadratic curve estimation of the dietary energy level and chest breadth, keel length, serum triglyceride content, the optimal dietary energy level was 11.420, 11.483 and 11.379 MJ/kg, which could be averaged to 11.427 MJ/kg. According to quadratic curve estimation of the dietary protein level and body weight, the optimal dietary protein level was 17.902%. Combined with the body size indexes, growth performance, and serum biochemical indexes, the dietary energy and crude protein requirements of Dawufen No.1 commercial layer chicks aged 5 to 9 weeks are 11.427 MJ/kg and 17.902%, respectively.

Key words： Dawufen No.1 commercial layer chicks; energy; protein; requirement; regression analysis

Cite this article

ZHANG Meng, LI Qiang, LIU Ping, XU Lijun, SU Kun, WANG Dehe, ZHOU Rongyan, CHEN Hui . Study on Dietary Energy and Protein Requirements of Dawufen No.1 Commercial Layer Chicks Aged 5 to 9 Weeks[J]. Chinese Journal of Animal Nutrition, 2018 , 30(7) : 2529 -2540 . DOI: 10.3969/j.issn.1006-267x.2018.07.013

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