Methionine Allowance for Hy-Line Brown Laying Hens Aged from 25 to 48 Weeks

GUO Dan, YUE Hongyuan, ZHANG Haijun, WANG Jing, XU Li, WU Shugeng, CHEN Zhengling, WU Chuanlong

doi:10.3969/j.issn.1006-267x.2016.03.011

Chinese Journal of Animal Nutrition >

2016 , Vol. 28 >Issue 3: 712 - 719

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.03.011

Poultry Nutrition

Methionine Allowance for Hy-Line Brown Laying Hens Aged from 25 to 48 Weeks

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1. College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China;
2. Key Laboratory of Feed Biotechnology of Ministry of Agriculture, National Engineering Research Center of Biological Feed, Feed Research Institute, The Chinese Academy of Agricultural Sciences, Beijing 100081, China;
3. Ningxia Unisplendour Chemical Methionine Co., Ltd., Zhongwei 751700, China

Received date: 2015-10-09

Online published: 2016-03-14

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Abstract

The experiment was conducted to evaluate the allowance of methionine (Met) for Hy-Line Brown laying hens from 25 to 48 weeks of age. Seven hundred and twenty Hy-Line Brown laying hens aged at 24 weeks were randomly divided into 6 groups with 6 replicates containing 20 hens each. The Met content of control group without adding DL-Met was 0.25%, and Met levels for DL-Met addition groups were 0.31%, 0.35%, 0.39%, 0.43% and 0.47%, respectively. The experiment lasted for 24 weeks. The result showed as follows: 1) The increase of Met levels significantly increased egg-laying rate and daily egg production (P<0.05), decreased the ratio of feed to egg (P<0.05), and 0.35% and 0.39% Met supplemental groups got the better effects. The average daily feed intake and average egg weight were also improved but not significantly different (P>0.05). 2) According to quadratic curve estimation of egg-laying rate, daily egg production, the ratio of feed to egg and average egg weight, the optimal Met allowance for laying hens was 0.36% and 0.38%, during the trial period from 1 to 8 weeks and from 9 to 24 weeks respectively. 3) Dietary Met level did not affect plasma total protein (TP) content (P>0.05), but significantly increased plasma albumin (ALB) content when Met at 0.31%, 0.39% or 0.43% level at the end of the fourth week compared with the control group (P<0.05). Dietary Met level did not significantly influence the plasma TP, ALB and urine acid (UA) contents at the end of the eighth week (P>0.05). Dietary Met level did not significantly influence the plasma TP and UA contents at the end of the twenty fourth week (P<0.05). Therefore, these overall results suggest that the allowance of Met for Hi-Line Brown laying hens aged from 25 to 32 weeks and from 33 to 48 weeks may be recommended at 0.36% and 0.38%, respectively.

Key words： DL-Met; laying hens; performance; blood biochemistry

Cite this article

GUO Dan, YUE Hongyuan, ZHANG Haijun, WANG Jing, XU Li, WU Shugeng, CHEN Zhengling, WU Chuanlong . Methionine Allowance for Hy-Line Brown Laying Hens Aged from 25 to 48 Weeks[J]. Chinese Journal of Animal Nutrition, 2016 , 28(3) : 712 -719 . DOI: 10.3969/j.issn.1006-267x.2016.03.011

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