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Modelling Methionine Requirements of Fast- and Slow-Growing Chinese Yellow-Feathered Chickens during the Starter Phase

文献类型： 外文期刊

作者： Li, Long 1 ; Abouelezz, K. F. M. 2 ; Cheng, Zhonggang 2 ; Gad-Elkareem, A. E. G. 3 ; Fan, Qiuli 2 ; Ding, Fayuan 2 ; G 1 ;

作者机构： 1.South China Agr Univ, Coll Anim Sci, Guangzhou 510642, Peoples R China

2.Guangdong Acad Agr Sci, Guangdong Publ Lab Anim Breeding & Nutr,Guangdong, Key Lab Anim Nutr & Feed Sci South China,Minist A, Inst Anim Sci,State Key Lab Livestock & Poultry B, Guangzhou 510640, Peoples R China

3.Assiut Univ, Fac Agr, Dept Poultry Prod, Assiut 71526, Egypt

4.Evonik Ind AG Hlth & Nutr, D-463457 Hanau, Germany

关键词： amino acids; nutrient requirements; growth indices; modeling; Chinese yellow-feathered chickens

期刊名称：ANIMALS （ 影响因子：2.752； 五年影响因子：2.942 ）

ISSN： 2076-2615

年卷期： 2020 年 10 卷 3 期

页码：

收录情况： SCI

摘要： Simple Summary In poultry production, consuming diets with low or excessive methionine levels leads to negative effects on growth performance. The requirements of methionine may differ among the fast and slow-growing breeds; therefore, the optimal dietary methionine level should be estimated for each. In this study, six dietary methionine levels were evaluated to estimate the optimal level for fast and slow-growing yellow feathered chicken breeds. The quadratic polynomial and exponential asymptotic regression showed that the optimal methionine requirements for maximal growth performance were 0.50% and 0.53% in the fast-growing breed, and 0.48% and 0.52% in the slow growing breed. Abstract Two experiments were carried out to investigate the dietary methionine requirement for fast and slow-growing Chinese yellow-feathered breeds during the starter phase, based on growth variables and regression models. In Experiment 1, a total of 2880 one-day-old Lingnan chicks (fast growing breed) were used to test the methionine requirement from 1 to 21 days of age for males and females separately. Of each gender, 1440 birds were allocated into 6 dietary methionine levels (0.28%, 0.32%, 0.37%, 0.43%, 0.50% and 0.63%), each with 6 pen replicates of 40 chicks. Experiment 2 had the same design with Guangxi chicks (slow growing breed) from 1 to 30 d of age. Results indicated that significant nonlinear or quadratic responses to increasing dietary methionine levels were observed in body weight, daily gain, feed intake and feed conversion ratio of both breeds. In summary, the quadratic polynomial regression showed that the optimal methionine requirements for maximal growth performance of Lingnan chickens were 0.52-0.58% in males, 0.51% in females, and 0.53% in mixed genders. The corresponding values for Guangxi breed were 0.53% in males by quadratic polynomial regression and 0.43% in females, and 0.48% to 0.49% in mixed sexes by exponential asymptotic models.

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