Effect of Yeast Phytase on Phosphorus Absorption in Pigs Fed a Corn-soybean Meal Based Diet

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Six male pigs (Gottingen) aged 11 months were allotted to a 6×6 Latin square design. Pigs were fed a diet containing a sufficient amount of phosphorus (P-sufficient diet) or a phosphorus deficient diet (basal diet). The basal diet was supplemented with 0, 1, 000, 2, 000 or 4, 000 phytase unit (PU)/kg of yeast phytase, or 1, 000PU/kg of Aspergillus niger phytase. Apparent absorption of phosphorus was increased (P<0.05) by the supplementation of 2, 000 and 4, 000PU/kg of yeast phytase. Although phosphorus absorption in pigs given 1, 000PU/kg of Aspergillus niger phytase did not differ significantly from those given 2, 000PU/kg of yeast phytase, the pigs given 1, 000 PU/kg of Aspergillus niger phytase tended to absorb more phosphorus than did the pigs given 1, 000PU/kg of yeast phytase (P=0.14). Based on linear equation generated for the levels of yeast phytase and absorption of phosphorus, 1, 000PU/kg of Aspergillus niger phytase was equivalent to 2, 180PU/kg of yeast phytase. These results suggested that supplementation with yeast phytase increased phosphorus absorption in pigs, however, yeast phytase was less effective than Aspergillus niger phytase.
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