Effects of Different Dietary Energy and Crude Protein Levels on Performance, Egg Quality and Serum Biochemical Indices of Xinyang Green Shell Laying Hens during Late Stage of Egg Production

QI Mingxing, DING Ke, LI Lanlan, ZHANG Nannan, YAN Huaxiang, ZOU Xiaoting

doi:10.3969/j.issn.1006-267x.2017.04.010

2017 , Vol. 29 >Issue 4: 1159 - 1166

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.04.010

Molecular Nutrition

Effects of Different Dietary Energy and Crude Protein Levels on Performance, Egg Quality and Serum Biochemical Indices of Xinyang Green Shell Laying Hens during Late Stage of Egg Production

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1. Key Laboratory of Animal Nutrition and Feed Science of Ministry of Agriculture, Feed Science Institute, Zhejiang University, Hangzhou 310058, China;
2. Shanghai Poultry Breeding Co., Ltd., Shanghai 201399, China

Received date: 2016-10-14

Online published: 2017-04-14

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Abstract

This study was conducted to investigate the effects of different dietary energy and crude protein levels on performance, egg quality and serum biochemical indices of Xinyang green shell laying hens during late stage of egg production (44 to 56 weeks of age), and to obtain the optimum energy and protein proportion for them. A total of 768 Xinyang green shell laying hens at the end of 43 weeks of age were randomly allocated to 6 groups, each of which included 4 replicates of 32 hens. A 2×3 factorial design with two levels of metabolizable energy (ME:10.87 and 11.08 MJ/kg) and three levels of crude protein (CP:15.00%, 15.50% and 16.00%) was used in this experiment to prepare 6 different diets. The pre-trial period was one week, and the trial period was 12 weeks. The results showed as follows:1) different dietary ME and CP levels had significant effects on laying rate and the ratio of feed to egg (F/E) of Xinyang green shell laying hens during late stage of egg production (P<0.05). The interaction between ME and CP level was significant on laying rate (P<0.01). The laying rate was the highest and the F/E was the lowest in high energy and low protein group with 11.08 MJ/kg ME and 15.00% CP. 2) Dietary 16.00% CP level significantly increased Haugh unit (P<0.05) and dietary 11.08 MJ/kg ME level significantly increased yolk color (P<0.05) of eggs of Xinyang green shell laying hens during late stage of egg production. There was no interaction between ME and CP level on egg quality (P>0.05). 3) Serum urea nitrogen content was the lowest in high energy and low protein group. Dietary 11.08 MJ/kg ME level significantly decreased serum total cholesterol content of green shell laying hens (P<0.05). In summary, under the conditions of this experiment, dietary 11.08 MJ/kg ME and 15.00% CP can benefit to increase performance and promote egg quality of Xinyang green shell laying hens during late stage of egg production.

Key words： green shell hens; late stage of egg production; metabolizable energy; crude protein; optimum proportion

Cite this article

QI Mingxing, DING Ke, LI Lanlan, ZHANG Nannan, YAN Huaxiang, ZOU Xiaoting . Effects of Different Dietary Energy and Crude Protein Levels on Performance, Egg Quality and Serum Biochemical Indices of Xinyang Green Shell Laying Hens during Late Stage of Egg Production[J]. Chinese Journal of Animal Nutrition, 2017 , 29(4) : 1159 -1166 . DOI: 10.3969/j.issn.1006-267x.2017.04.010

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