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

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) wer...

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Bibliographic Details
Published in:Animals (Basel) 2020-03, Vol.10 (3), p.443
Main Authors: Li, Long, Abouelezz, K F M, Cheng, Zhonggang, Gad-Elkareem, A E G, Fan, Qiuli, Ding, Fayuan, Gao, Jun, Jiang, Shouqun, Jiang, Zongyong
Format: Article
Language:English
Subjects:
Amino acids
Birds
Body weight
Chickens
Chicks
chinese yellow-feathered chickens
Conversion ratio
Diet
DNA methylation
Feed conversion
Females
Food and nutrition
Gender
growth indices
Health aspects
Juveniles
Males
Methionine
modeling
nutrient requirements
Nutritional requirements
Physiological aspects
Polynomials
Poultry
Regression analysis
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Summary: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.
ISSN:2076-2615
2076-2615
DOI:10.3390/ani10030443