抄録
In order to clarify differences in the digestion and absorption process of raw and heated defatted soybean meals (SBM) in juvenile yellowtail Seriola quinqueradiata, the fish were force-fed with the two kinds of SBMs as well as raw fish and fish meal as control, and post-feeding changes in digesta quality, serum constituent concentrations, and protein digestibility were determined. The intestinal digesta contents were higher in the fish fed with either SBM than those in the fish fed with raw fish during the experimental period. The digesta in the raw SBM-fed group passed rapidly through the stomach and intestine at a similar speed as in the raw fish-fed group, but the solubility and digestibility of the intestinal digesta protein and serum free amino acid concentration were lowest among the four protein sources, probably due to the activity of trypsin inhibitor in raw SBM. On the other hand, the digesta in the heated SBM-fed group passed slowly through the digestive tracts, and the solubility of the intestinal digesta protein was higher than that in the raw SBM group, while being similar to that in the fish meal-fed group. These results indicate that the digestion and absorption process of raw SBM was disturbed by its trypsin inhibitor, but was improved by heating to a similar degree to fish meal under the experimental conditions.
