Soybean Checkoff - funded
نویسنده
چکیده
This study was carried out to investigate the nutritional values of soybean meals (SBM) from various geographic origins and the effects of their dietary supplementations on performance of broiler chicken. Nutritional values of dehulled SBM originated from USA, and nondehulled SBM from India (IND) and Argentina (ARG) were evaluated by analyzing chemical composition, urease activity(UA) and KOH solubility and determining true metabolizable energy (TME), nitrogen corrected TME (TMEn) and true amino acid availability (TAAA). The contents of crude protein ranged from 45.43% (ARG) to 48.47% (USA) and those of crude fiber varied widely from 3.48% (USA) to 7.12% (IND). The measurements of lysine were from 2.79% (IND) to 3.09% (USA) and those of methionine from 0.56% (IND) to 0.65% (USA). The values of TMEn varied from 2986.6 kcal/kg (IND) to 3228.9 kcal/kg (USA) and the averages of TAAA were from 91.61% (IND) to 92.27% (USA). UA were found to be from 0.02 (ARG) to 0.04 (USA) and those of KOH solubility from 73% (ARG) to 84% (USA). A total of three hundred 20-d-old male broiler chicks were divided into three groups and fed isocaloric and isonitrogenous experimental diets containing 27.5% of SBM each and same amounts of lysine and sulfur amino acids for 15 days. Final body weight and body weight gain were highest in USA and lowest in IND although the differences were not significant statistically. The feed/gain in chicks fed diet containing USA SBM was significantly improved (p<0.05) compared to those of the other groups. There were no significant differences in carcass characteristics and blood profiles among the treatments. The results of in vitro assay and bioassay agreed with performance of broiler chicks, and thus there were close correlation among the broiler performance, and the measured nutritive values of SBM. Economical analysis revealed that USA SBM was highest in price. However, the cost per kg live weght gain was lowest with USA (488 ₩/kg live WT) compared to ₩ 504 of ARG and ₩ 505 of IND. In conclusion, dehulled SBM from USA was superior to non-dehulled SBM from ARG and IND with regard to not only nutritive value but also economical efficiency.
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