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The effect of phytase on apparent digestibility of four practical plant feedstuffs fed to striped bass, Morone saxatilis. Research was reported that compared the effects of added
phytase on the apparent dry matter, crude protein and phosphorus digestibility
of isolated soy protein, soybean meal, corn gluten meal and wheat middling
when fed to striped bass (Morone saxatilis). The test ingredients were
blended into the reference diet to achieve total phosphorus levels of
0.67-0.73 percent and a 35 percent minimum crude protein level. A phytase
solution was sprayed on the pelleted diet at the rate of 1000 phytase
units per kilogram of dry diet. The diets were fed to 3-year old striped
bass. Results indicated that the digestibility of dry matter was significantly
lower for the wheat middling and soybean meal diets compared to the
corn gluten meal and isolated soy protein diets. Phytase supplementation
did not affect dry matter or protein digestibility. The addition of
phytase to the pelleted diet increased the phosphorus digestion by about
23 percent for all four feedstuffs. These results indicate that phosphorus
digestibility may be significantly improved by phytase additions to
the diet.
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