It has been reported that methionine and cystine are capable of accelerating the healing rate of wounds in injured rats to the same extent when present in the diet in equivalent amounts (1). This response was elicited in both the presence and the absence of dietary protein (2). Lysine, tryptophan, and valine do not appear to alter the healing process to a significant degree (3). Because methion...

All procedures of our experiments were approved by the animal care and welfare committee of the Institute of Animal Science of Chinese Academy of Agricultural Sciences. Two dose-response experiments were conducted to assess the bioefficacy and toxicity of DL-methionine hydroxy analog free acid (MHA-FA) relative to DL-methionine (DLM) in White Pekin ducks. In experiment 1, the methionine-deficie...