Poultry Nutrition

Dietary Methionine Requirement of Xinyang Green Shell Laying Hens

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  • 1. Key laboratory of Animal Nutrition and Feed Science of Agriculture, Feed Science Institute, Zhejiang University, Hangzhou 310058, China;
    2. Shanghai Poultry Breeding Co., Ltd., Shanghai 201399, China;
    3. Tongxiang Longxiang Service Center of Agricultural Economy, Tongxiang 314500, China

Received date: 2014-04-21

  Online published: 2014-09-10

Abstract

This study was conducted to investigate the effects of methionine (Met) on performance, egg quality,and total protein (TP), albumen (ALB), urea nitric (UN) and urea acid (UA) contents in serum of green shell laying hens, and to obtain the optimal methionine requirement of green laying hens (34 to 43 weeks of age). A total of 1 440 Xinyang green laying hens aged 34 weeks were randomly allocated to 6 groups with 4 replicates of 60 hens per replicate. The control group was given a basal corn-soybean meal diet containing 0.24% Met. The Met levels in diets of the experimental groups were 0.27%, 0.30%, 0.33%, 0.36% and 0.39%, respectively. The trial lasted for 10 weeks. The results showed as follows: 1) compared with 0.24% and 0.39% Met groups, laying rate in 0.27% Met group were significantly increased by 3.75% and 3.97% (P<0.05), respectively. Feed to egg ratio in 0.27% Met group were significantly decreased by 2.99%, 2.40%, 2.40%, 3.56% and 6.88% (P<0.05), compared with that in control group and 0.30%, 0.33%, 0.36% and 0.39% Met groups, respectively. Average egg weight in 0.33% Met group was drastically higher than that in 0.24%, 0.36% and 0.39% Met groups. 2) Compared with 0.39% Met group, albumen height and haugh unit in 0.30% Met group were significantly increased by 19.31% and 9.44% (P<0.05), respectively. 3) Compared with 0.24%, 0.36% and 0.39% Met groups, serum UA content in 0.27% Met group was significantly decreased by 24.36%, 23.21% and 22.60% (P<0.05), respectively. 4) Apparent digestibility of aspartic acid, cystine and Met in 0.27% Met group was significantly higher than that in 0.39% Met group (P<0.05). 5) According to quadratic regression curve analysis based on laying rate, feed to egg ratio and albumen height, the optimal dietary requirements of Met for green shell laying hens were 0.26%, 0.28% and 0.29%, respectively. The results indicate that optimal Met level in diets can enhance protein availability, promote performance and improve egg quality of laying hens. The optimal Met requirement in corn-soybean meal diet of Xinyang green shell laying hens (34 to 43 weeks of age) is 0.26% to 0.29%.

Cite this article

SONG Huahui, YUAN Chao, ZHANG Xiaoyun, YAN Huaxiang, JIANG Bairong, ZOU Xiaoting . Dietary Methionine Requirement of Xinyang Green Shell Laying Hens[J]. Chinese Journal of Animal Nutrition, 2014 , 26(9) : 2574 -2581 . DOI: 10.3969/j.issn.1006-267x.2014.09.017

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