Discipline: Veterinary Medicine
Four hundred eighty day-old male Ross broiler chicks were used in a ten-day bioassay trial to assess the performance of three sources of soybean meals (SBM), namely Owensboro, United States (US) and Argentine soybean meals, in two semi-purified dietary regimes that were either high in energy but low in protein (cornstarch-dextrose based semi-purified diet) or low in energy but high in protein (peeled cassava meal-based semi-purified diet) using protein efficiency ratio (PER) as the method of measurement. Among the sources of soybean meal fed in cornstarch dextrose semi-purified diet, US SBM significantly gave the superior feed conversion ratio (FCR) and PER (p<0.01) while Owensboro SBM had the highest feed consumption but same average gain as with US SBM. Birds fed with Argentine SBM significantly performed less than birds fed with other soybean meal sources. In contrast, birds fed with cassava-based semi-purified diet did not result to significant differences in all parameters. Results suggested that it is possible to distinguish the qualities of soybean oil meal from various sources through a ten-day bioassay procedure using cornstarch-dextrose based semi-purified diet. This study demonstrated that the performance and PER of birds fed with US SBM are better than SBM from other origins used in the study.