The Thai Journal of Veterinary Medicine


Nine hundred and sixty day-old chicks of both sexes were divided into 24 groups of 40 birds each and fed for 42 days. Diets were prepared and fed over two phases (1-21 and 22-42 days of age). They were calculated to be deficient either in methionine and sulfur amino acids (negative control diet) or supplemented with 0.24% DL-Methionine (DL-M) or 0.37% Methionine Hydroxy Analogue (MHA). Weight gain and feed intake were calculated so that an evaluation of the efficacy of the 2 sources of methionine could be made. A significant response (P<0.05) in the average weight gain over negative controls (0.55+0.01 kg/bird) was found for DL-M supplemented diets (0.59± 0.01 kg/bird) in phase I, whereas MHA (0.57±0.01kg/bird) did not show any improvement. The feed conversion ratio of DL-M (1.80±0.03) and MHA (1.82±0.04) was significantly different to the negative control (1.93±0.03). There were no significant differences in all performances during phase II. The overall results showed that broilers fed with 0.24% DL-Methionine or 0.37% Methionine Hydroxy Analogue fortified rations showed the same growth rates. It may be concluded that MHA was 65% as efficient as DL-methionine in broiler chicks during the 1-21 day old period of their lives.

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