Journal
BRITISH JOURNAL OF NUTRITION
Volume 95, Issue 4, Pages 703-708Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1079/BJN20051716
Keywords
mass spectrometry; methionine; protein expression; proteomics
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The present study evaluated the effect of dietary methionine on breast-meat accretion and protein expression in skeletal muscle of broiler chickens in vivo. All broilers received a common pre-test diet up to 21 d of age, and were subsequently fed either a methionine-deficient (MD) or -adequate (MA) diet (3(.)1 v. 4(.)5 g/kg diet) from age 21 to 42 d. Dietary cystine levels were 3(.)7 v. 3(.)6 g/kg diet for the MD and MA diet, respectively. Detrimental effects on carcass yield (P=0(.)004), abdominal fat percentage (P=0(.)001), and breast-meat weight (P=0(.)001), yield (P=0(.)001), and uniformity (P=0(.)002) were observed and validated in birds fed MD diets. Via tandem MS, a total of 190 individual proteins were identified from pectoralis major (PM) muscle tissue. From the former composite, peptides from three proteins were observed to be present exclusively in breast muscle from those chickens fed the MD diet (pyruvate kinase, myosin alkali light chain-1, ribosomal-protein-L-29). No proteins were observed to be uniquely expressed in chickens fed MA diets. Research is warranted to further explore the possibility of the proteins pyruate kinase, myosin alkali light chain-1, or ribosomal protein L-29, as potential biological indicators of differences in protein expression of PM of chickens in response to a dietary methionine deficiency.
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