Stable isotopes to study sulfur amino acid utilization in broilers

Animal : an International Journal of Animal Bioscience
Rafael M SuzukiNilva K Sakomura

Abstract

Nutritionists have been discussing whether the dietary supplementation of cyst(e)ine is required as a part of the dietary methionine (Met) in the total sulfur amino acid (TSAA) requirement to achieve optimum performance in broilers. Part of Met is converted to cysteine (Cys) to meet the Cys requirement, especially for feather growth. The TSAA requirement has been determined by using graded levels of free Met in the diet, without supplementation of free cyst(e)ine. It has also been argued that the Met to Cys ratio (Met : Cys) changes with age and even with different Met sources. The objective of this study was to evaluate the two sources of Met, while determining the proportion of Met and Cys in total dietary TSAA that optimize the performance of broilers. A performance assay was carried out in a factorial arrangement (5 × 2) using 1080 broilers from 42 to 56 days of age fed diets having different dietary proportions of Met and Cys (44 : 56, 46 : 54, 48 : 52, 50 : 50 or 52 : 48) while maintaining the same dietary TSAA in the diets. Two synthetic Met sources (dl-Met or l-Met) were used for each of the diets with different dietary Met : Cys ratios. Twenty-one broilers of the same age were fed the diets 44 : 56, 48 : 52 and 52 : 48...Continue Reading

References

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Feb 9, 2017·Rapid Communications in Mass Spectrometry : RCM·Christopher T Yarnes, Julian Herszage

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Citations

Jan 8, 2021·Journal of Animal Physiology and Animal Nutrition·Rafael Massami SuzukiNilva Kazue Sakomura
Dec 3, 2020·Animals : an Open Access Journal From MDPI·Andreas LemmeJuliano Cesar de Paula Dorigam

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