Bioavailability comparison between herbal methionine and DL-methionine on growth performance and immunocompetence basis in broiler chickens

Herbal methionine can be compared relative to Dl-methionine with evaluation of bioavailability of this source of methionine. An experiment was carried out to determine the relative bioefficacy of herbal methionine [H-Met][registered sign] relative to DL-methionine [DL-Met] on performance criteria and immunocompetence of Met sources in male broilers. Atotal of 160 male broilers were fed a Met-deficient basal diet or the basal diet supplemented with three or four concentrations of each Met sources. Multiexponential and multilinear regressions were used to determined bioavailability of herbal methionine [HMet] [registered sign]relative to DL-Met on performance and immunocompetence of broilers. Body weight gain and feed intake of the broilers fed H-Met or DL Met improved in the experiment, regardless of Met sources, relative to those broilers that were fed the basal diet. Immunocompetence of broilers were not significant at 28 day of age [p>0.05], whereas the broilers were significantly affected by the additional levels of Met sources at 42 day of age. The bioefficacy estimates for H-Met[registered sign] relative to DL-Met on a product basis were 55% for weight gain, 71% for feed intake, 78% for feed conversion ratio, 70% for dilution 1-choloro 2- 3-dinitrobenzene [DNCB], 67% for sheep red blood cell [SRBC], and 68% for phytohemagglutinine [PHA-P]. The relative effectiveness of H-Met[registered sign] compared to that of DL-Met is 68% on average across performance criteria and all immune criteria tested. H-Met[registered sign]can be supplemented as a new and natural source of Met for the poultry industry

Relative effectiveness of herbal methionine compared to DL-methionine on growth, performance and carcass responses basis in broiler chickens

The degree to which the amount of an ingested nutrient is absorbed and available to the body is called bioavailability. Relative effectiveness of herbal methionine [H-Met[R]] compared to DL-methionine [DL-Met] was investigated in this experiment. Exponential regression analysis was used to determine bioefficacy of H-Met[R] based on body weight gain, feed intake and feed conversion. DLMet and H-Met[R] were added to a basal diet in 3 and 4 levels, respectively, in starter, grower and finisher periods. Therefore, that met the nutrient and energy requirements of broiler chickens, with the exception of Met+Cys. In the 42-d trial, broilers growth increased significantly [p<0.05], relative to those broilers fed basal diet, regardless of Met sources. Carcass characteristics did not respond significantly to the supplemental Met. Regression analysis revealed that H-Met[R] was 52% [body weight gain], 72% [feed intake] and 77% [feed conversion ratio] as efficacious as DL-Met. H-Met[R] can be administered as a new and a natural source of Met in poultry industry