Efficacv of the fermented soybean meal with high phytase activity on phosphorus availability in monogastric animals.

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In the first experiment, growing pigs were fed a soybeam meal-based diet (SBM), a fermented soybean meal-based diet (FSBM) or a SBM-based diet supplied inorganic phosphate (SBM+P) and mineral availability was investigated. The apparent absorption rate was higher in the FSBM group than in the other group. The apparent phosphorus absorption did not differ between the SMB group and the SBM+P group. The fermentation did not affect copper availability. However, the FSBM group showed higher concentrations of femoral zinc and liver iron than did the other groups. These results indicated that the fermentation degraded phytate in soybean meal, which resulted in the improvement of these mineral availabilities. In the second experiment, growing pigs were fed a SBM-based diet, a FSBM-diet or Skim milk (SM)-based diet to study the absorption of calcium and ionized calcium concentration in the digesta of small intestine. Calcium absorption was lower in the SBM and the FSBM groups than in the SM group. The concentration of ionized calcium in duodenal and ileal digesta was also lower in the SBM and the FSBM groups than in the SM group. These results suggested that soy-based diets suppressed calcium absorption through reducing ionized calcium in the small intestine. Additionally, phytate in SBM did not affect calcium absorption and the concentration of ionized calcium in the digesta of the small intestine.