An experiment was conducted for comparative study on the performance of commercial broiler chickens fed ration with DL-methionine or with herbal methionine. A-day old, 180 Ven Cobb broiler chicks were randomly divided into three experimental groups, comprising three replicates. Each replicate was consisted of 20 birds. The birds were fed basal diet without methionine supplementation (C), diet with DL-methionine at 1.2 kg ton-1 of feed (T1) and diet with herbal-methionine at 1.2 kg ton-1 of feed (T2). Superior performance (p<0.05) in body weight gain and Feed Conversion Ratio (FCR) were found in methionine supplemented group in either synthetic or herbal form. The cumulative feed and protein consumption were varied significantly (p<0.01) among the groups due to dietary treatments. Protein and energy utilization percentage was also varied significantly (p<0.01) among the groups. Liver protein, lipid and triglyceride varied (p<0.01) due to supplementation of DL-methionine or herbal methionine. Though methionine supplemented groups had little effect on meat quality but had supper effect on feather quality of broiler chicken. Statistical analysis revealed that cost benefit ratio was found significantly and economically viable in T1 and T2 groups than control. In terms of body weight gain, FCR, protein and energy utilization ability, feather quality, the superior performances were found in methionine (both form) supplemented group than control group where no methionine either synthetic or herbal form was supplemented form external source.
G. Halder and B. Roy, 2007. Effect of Herbal or Synthetic Methionine on Performance, Cost Benefit Ratio, Meat and Feather Quality of Broiler Chicken. International Journal of Agricultural Research, 2: 987-996.