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

Animals : an Open Access Journal From MDPI
Long LiZongyong Jiang

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 expone...Continue Reading

References

Jul 1, 1997·Poultry Science·S Leeson, A K Zubair
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Aug 15, 2008·Journal of Animal Physiology and Animal Nutrition·D JamrozT Wertelecki
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Dec 8, 2017·Animal Science Journal = Nihon Chikusan Gakkaihō·Shouqun JiangZongyong Jiang
Oct 18, 2018·Poultry Science·A N MayerT L Noetzold
Jul 26, 2019·Animals : an Open Access Journal From MDPI·L LiZ Jiang

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Citations

Sep 17, 2020·Animals : an Open Access Journal From MDPI·Zhi YangZhiyue Wang

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Methods Mentioned

BETA
ion-exchange chromatography

Software Mentioned

SAS

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