Efficacy of yeast phytase in improving phosphorus bioavailability in a corn-soybean meal-based diet for growing pigs

摘要: Crossbred barrows (n = 66; 6 wk old) were used in a 6-wk experiment to evaluate the efficacy of phytase from yeast or Aspergillus niger on performance, tibial characteristics, and serum inorganic P concentration. We also investigated stability these phytases acidic solutions with pepsin, which simulated gastric conditions. Pigs fed P-adequate diet containing .34% nonphytate-P low-P .20% nonphytate-P. The was supplemented 0, 1,000, 2,000, 4,000 units (PU; activity at optimal pH, i.e., pH 4.2 for 5.5 niger)/kg phytase, 1,000 PU/kg niger. graded level linearly increased ADG (P .047), weight .091), density .31) between pigs given those phytase. These results suggested that improves bioavailability growing but is less than During incubation < .001) lost more its This lesser may be responsible poorer In summary, supplementation swine diets beneficial,