Effects of Low Crude Protein Diets in Ideal Amino Acid Pattern on Performance of Laying Hens

REN Bing; WU Shugeng; JI Feng; ZHANG Haijun; YUE Hongyuan; DONG Yan; GAO Yupeng; QI Guanghai

doi:10.3969/j.issn.1006-267x.2012.08.009

Chinese Journal of Animal Nutrition >

2012 , Vol. 24 >Issue 8: 1459 - 1468

DOI: https://doi.org/10.3969/j.issn.1006-267x.2012.08.009

Molecular Nutrition

Effects of Low Crude Protein Diets in Ideal Amino Acid Pattern on Performance of Laying Hens

REN Bing ,
WU Shugeng ,
JI Feng ,
ZHANG Haijun ,
YUE Hongyuan ,
DONG Yan ,
GAO Yupeng ,
QI Guanghai

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1. College of Animal Science and Technology, Northwest A & F University, Yangling 712100, China;
2. Feed Research Institute, The Chinese Academy of Agricultural Sciences, Beijing 100081, China;
3. Health and Nutrition Division, Evonik Degussa Investment Co., Ltd., Beijing 100176, China

Received date: 2012-02-27

Online published: 2012-08-03

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Abstract

This experiment was conducted to study the effects of low crude protein diets in ideal amino acid pattern on performance, egg quality, the concentrations of plasma uric acid and whole blood ammonia, and nitrogen content in excretion of laying hens aged 21 to 32 weeks. Hy-Line Grey laying hens (n=540) were randomly allotted into one of the five dietary treatments, which had 17.0%, 16.5%, 16.0%, 15.5% and 15.0% crude protein levels at the same dietary energy of 11.00 MJ/kg, respectively. Each treatment contained 6 replicates of 18 hens. The trial lasted for 12 weeks. The results showed as follows: in ideal amino acid pattern, average daily feed intake, daily egg yield and egg/feed were not be affected (P>0.05), while laying rate was significantly affected by dietary crude protein level (P<0.05), and average egg weight was tended to be decreased during this trial (P=0.06). The egg quality parameters, such as albumen height and Haugh unit, were significantly affected by dietary crude protein level (P<0.01). The dietary crude protein level significantly affected yolk color (P<0.05), but did not affect eggshell thickness and strength (P>0.05). There were no significant effects on egg components, but the albumen content in egg was tended to be decreased with the decreasing of dietary crude protein level (P=0.09). The concentrations of plasma uric acid and whole blood ammonia among treatments were not be affected by dietary crude protein level (P>0.05). As dietary crude protein level decreased, the nitrogen content in excretion was significantly reduced (P<0.01). The results indicate that laying rate and egg quality in laying hens fed low crude protein diets added synthetic amino acids can be improved during the trial, and nitrogen excretion is significantly decreased.

Key words： low crude protein; laying hens; performance; egg quality; nitrogen content in excretion

Cite this article

REN Bing , WU Shugeng , JI Feng , ZHANG Haijun , YUE Hongyuan , DONG Yan , GAO Yupeng , QI Guanghai . Effects of Low Crude Protein Diets in Ideal Amino Acid Pattern on Performance of Laying Hens[J]. Chinese Journal of Animal Nutrition, 2012 , 24(8) : 1459 -1468 . DOI: 10.3969/j.issn.1006-267x.2012.08.009

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