Abstract
The alleviatory effect of essential amino acids on growth depression and elevation of plasma methionine (Met) concentration caused by dietary excess Met was studied. Eight-day-old female broiler chicks were divided into 10 groups of 4 chicks with same average body weight and fed each diet containing 0.45 (control) or 1.20% Met diet (excess) for 10 days. To the Met excess diet, 0.4% of individual amino acid, i.e. arginine, glycine (Gly), isoleucine, lysine, threonine (Thr), leucine, valine, or phenylalanine was added. Performance of chicks fed the Met excess diet decreased to 80% of the control group. Lowered performance of chicks fed the Met excess diet was recovered to 90% of the control group by Thr or Gly supplementation to the diet. Plasma concentration of Met increased from 78 to 272 nmol/ml by feeding Met excess diet, but those of Gly, serine and Thr did not change by dietary excess Met. A negative relationship was obtained between plasma Met concentration and body weight gain. The elevated plasma Met concentration was reduced to 63% that of the Met excess diet by Gly and Thr supplementation.
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