Digestible Methionine Requirement of Lueyang Black-Boned Chickens Aged from 7 to 12 Weeks

ZHANG Jing; MIN Yuna; NIU Zhuye; LIU Shaokai; WANG Zhepeng; LI Hualei; HE Zufu; LIU Fuzhu

doi:10.3969/j.issn.1006-267x.2014.03.025

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 3: 739 - 746

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.03.025

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Digestible Methionine Requirement of Lueyang Black-Boned Chickens Aged from 7 to 12 Weeks

ZHANG Jing ,
MIN Yuna ,
NIU Zhuye ,
LIU Shaokai ,
WANG Zhepeng ,
LI Hualei ,
HE Zufu ,
LIU Fuzhu

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College of Animal Science and Technology, Northwest A & F University, Yangling 712100, China

Received date: 2013-10-08

Online published: 2014-03-04

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Abstract

This experiment was conducted to evaluate the effects of dietary methionine level on growth performance, the development of tissues and organs and serum urea acid and urea nitrogen contents, and combined a metabolic trial to determine the digestible methionine requirement of Lueyang black-boned chickens aged from 7 to 12 weeks. The experiment was divided into two parts, part 1: six hundred 6-week-old Lueyang black-boned chickens were randomly allocated into 5 groups with 6 replicates per group and 20 birds per replicate. A single factorial experiment containing 5 methionine levels (0.22%, 0.32%, 0.42%, 0.52% and 0.62%) was undergone. Part 2: sixteen adult Lueyang black-boned male chickens with similar body weight were allocated into 2 groups, one group was the endogenous alignment group[body weight, (2.14±0.12) kg], and the other group was the experimental group[body weight, (2.09±0.14) kg]. The results showed as follows: 1) the average daily feed intake (ADFI) was significantly decreased by the methionine level (P<0.01). The average daily gain (ADG) was increased first and then decreased quadratically with the methionine level increasing (P<0.01, R²=0.691). Different methionine levels had no significant effect on feed/gain (F/G) (P>0.05). However, with the methionine level increasing, F/G was decreased first and then increased in a quadratic trend (P>0.05, R²=0.204). Different methionine levels significantly affected the relative growth rate[RGR(%)=100譩ody weight/initial body weight] (P<0.05). 2) Different levels of methionine did not have significant impacts on the serum urea acid and urea nitrogen contents, breast muscle rate, leg muscle rate, abdominal fat percentage as well as some organ development (P>0.05). 3) The apparent digestibility of methionine measured in the second part of the experiment was 92.05%, true digestibility of methionine was 94.97%. To ADG as the evaluation index, based on the quadratic curve model, the apparent digestible methionine requirement of Lueyang black-boned chickens is 0.326%, and true digestible methionine requirement is 0.336%.

Key words： methionine; digestibility; requirement; growth performance; Lueyang black-boned chicken

Cite this article

ZHANG Jing , MIN Yuna , NIU Zhuye , LIU Shaokai , WANG Zhepeng , LI Hualei , HE Zufu , LIU Fuzhu . Digestible Methionine Requirement of Lueyang Black-Boned Chickens Aged from 7 to 12 Weeks[J]. Chinese Journal of Animal Nutrition, 2014 , 26(3) : 739 -746 . DOI: 10.3969/j.issn.1006-267x.2014.03.025

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