Optimal Dietary Metabolizable Energy and Crude Protein Levels for Dawufen No.1 Commercial Layer Chicks from 0 to 4 Weeks of Age

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

doi:10.3969/j.issn.1006-267x.2019.02.021

2019 , Vol. 31 >Issue 2: 652 - 661

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.02.021

Molecular Nutrition

Optimal Dietary Metabolizable Energy and Crude Protein Levels for Dawufen No.1 Commercial Layer Chicks from 0 to 4 Weeks of Age

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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: 2018-07-12

Online published: 2019-02-18

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Abstract

To determine the optimal dietary metabolizable energy (ME) and crude protein (CP) levels of hatch to 4-week-age Dawufen No.1 commercial layer chicks, the effects of dietary ME and CP levels on the growth performance, body size traits, organ indexes and serum biochemical indexes of 0 to 4-week-age Dawufen No.1 commercial layer chicks were evaluated, and the regression models between the dietary ME or CP levels and testing indexes were built. A 3×3 two-factor experiment design was adopted in this experiment. Nine experimental diets were prepared, the ME levels in diets were 12.01, 12.51 and 13.01 MJ/kg, respectively, and the CP levels in diets were 19.81%, 20.81% and 21.81%, respectively. Eight hundred and ten 1-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. The experiment lasted for 28 days. The results showed as follows:1) dietary ME level had significant effects on the average daily gain (ADG), average day feed intake (ADFI), feed/gain (F/G), keel length, body weight, duodenum relative length and ileum relative length of layer chicks (P<0.05), and there was a significant quadratic curve relationship between dietary ME level and ADFI, F/G, the contents of serum glucose (GLU), triglyceride (TG) or total cholesterol (TC) (P<0.05). 2) Dietary CP level had significant effects on the chest width, liver index, duodenum relative length and ileum relative length (P<0.05), and there was a significant quadratic curve relationship between dietary CP level and chest breadth (P<0.05). 3) The interaction of dietary ME and CP levels had significant effects on ADG, F/G, duodenum relative length, ileum relative length and serum TG content (P<0.05). 4) According to fit quadratic curve, the best levels of ADFI, F/G, serum GLU, TG and TC contents were obtained when dietary ME levels were 6.991, 12.979, 10.524, 11.968 and 11.775 MJ/kg, respectively, and the best levels of liver index and chest breadth were obtained when dietary CP levels were 20.402% and 20.730%, respectively. Overall, when growth performance, body size traits, organ indexes and serum biochemical indexes are considered together, the optimal dietary ME and CP levels for 0 to 4-week-age Dawufen No.1 commercial layer chicks are 11.812 MJ/kg and 20.566%, respectively.

Key words： Dawufen No.1 commercial layer chicks; metabolizable energy level; crude protein level; requirement

Cite this article

ZHANG Meng, LI Qiang, LIU Ping, XU Lijun, SU Kun, WANG Dehe, ZHOU Rongyan, CHEN Hui . Optimal Dietary Metabolizable Energy and Crude Protein Levels for Dawufen No.1 Commercial Layer Chicks from 0 to 4 Weeks of Age[J]. Chinese Journal of Animal Nutrition, 2019 , 31(2) : 652 -661 . DOI: 10.3969/j.issn.1006-267x.2019.02.021

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