Abstract
Stability of Four Commercial Microbial Phytase Sources Under Increasing Conditioning Temperatures and Conditioner Retention Times During Pelleting
Highlights
Phosphorus is stored in plant tissues as phytic acid, a cyclic structure that is not digested by animals that lack the phytase enzyme
There was no evidence for a source × conditioning temperature × retention time interaction for hot pellet temperature or phytase stability
There was no evidence of difference in hot pellet temperature due to retention time
Summary
This experiment was designed to evaluate the effects of conditioning temperature and retention time on the stability of 4 commercially available microbial phytases in a cornsoybean meal diet. Treatments were arranged in a 4 × 3 × 2 factorial of phytase source (A, B, C, and D), conditioning temperature (180, 190, and 200°F), and conditioner retention time (30 and 60 s). Five cooled pellet samples per treatment per day were analyzed for phytase. There was no evidence for a source × conditioning temperature × retention time interaction for hot pellet temperature or phytase stability. There was no evidence of difference in hot pellet temperature due to retention time. There was a phytase source × conditioning temperature interaction (P = 0.01) for phytase stability. At conditioning temperatures of 180 and 190°F, phytase A had greater (P < 0.05) stability compared to all other sources. There was no evidence of difference in phytase stability due to retention time
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