Optimizing Requirements of Choline and Methionine Using Quadratic Regression Orthogonal Rotation Combination Design for Broilers Aged 1 to 21 Days

WANG Sijia; CAI Huiyi; LIU Guohua; YAN Haijie; LIAO Ruibo; DENG Huiling; TANG Jianping

doi:10.3969/j.issn.1006-267x.2012.05.003

2012 >Issue 5: 804 - 814

DOI: https://doi.org/10.3969/j.issn.1006-267x.2012.05.003

Swine and Poultry Nutrition

Optimizing Requirements of Choline and Methionine Using Quadratic Regression Orthogonal Rotation Combination Design for Broilers Aged 1 to 21 Days

WANG Sijia ,
CAI Huiyi ,
LIU Guohua ,
YAN Haijie ,
LIAO Ruibo ,
DENG Huiling ,
TANG Jianping

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Poultry Nutrition & Feed Department of Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received date: 2011-12-12

Online published: 2012-04-29

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Abstract

A research on choline and methionine requirements for broilers aged 1 to 21 days was carried out. A total of 480 one-day-old broilers were divided into 12 groups (4 replicates per group and each replicate had 10 broilers) in random. Groups 1- 8 were experiment groups, and Groups 9-12 were center groups. A diet with low levels of choline and methionine was used as a basal diet in this experiment. To study the influence of different choline and methionine levels on growth performance and slaughter performance, a two-factor combinational design of quadratic regression orthogonal rotation was used. The experiment lasted for 21 d. The results showed that a certain level of choline and methionine could improve average daily gain (ADG), feed/gain (F/G), dressing percentage and abdominal fat percentage of broilers aged 1 to 21 days. The response surface graphs showed that when methionine levels were 0.50%- 0.70%, the ADG was decreased with the reduction of choline levels. When methionine levels were 0.42%- 0.50% and choline levels were 1 300 - 1 738 mg/kg, the F/G was minimum. When methionine levels were 0.50%- 0.70%, the dressing percentage was decreased with the increasing of methionine levels; when methionine levels were 0.36%- 0.50%, the dressing percentage was improved with the addition of choline. Abdominal fat percentage was decreased with the rise of choline levels; when choline levels were 1 300 - 1 920 mg/kg, abdominal fat percentage was decreased with the reducing of methionine levels. It can be concluded that the requirements of choline and methionine for optimal growth performance are 1 434 - 1 631 mg/kg and 0.47%, respectively. The requirements of choline and methionine for optimal slaughter performance are 1 984 mg/kg and 0.49%, respectively.

Key words： choline; methionine; broiler; quadratic regression orthogonal rotation combination design; response surface

Cite this article

WANG Sijia , CAI Huiyi , LIU Guohua , YAN Haijie , LIAO Ruibo , DENG Huiling , TANG Jianping . Optimizing Requirements of Choline and Methionine Using Quadratic Regression Orthogonal Rotation Combination Design for Broilers Aged 1 to 21 Days[J]. Chinese Journal of Animal Nutrition, 2012 , (5) : 804 -814 . DOI: 10.3969/j.issn.1006-267x.2012.05.003

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