Effects of microbial phytase on coefficient of standardized total tract digestibility of phosphorus in growing pigs fed corn and corn co-products, wheat and wheat co-products and oilseed meals

Three experiments were conducted to determine the effects of microbial phytase on the coefficient of standardized total tract digestibility (CSTTD) of phosphorus (P) in corn and wheat and various co-products of these grains and in oilseed meals fed to growing pigs. In Exp. 1, 90 barrows (initial body weight: 39.27 ± 2.22 kg) were individually housed and allotted to 1 of 14 cornstarch-based diets based on corn or distillers dried grains with solubles (DDGS; low, medium, or high oil), corn gluten feed, corn gluten meal or corn germ meal with 0 or 500 units per kilogram of microbial phytase (n = 6). A P-free diet was used to determine basal endogenous P loss (EPL). The results showed that the CSTTD of P was greater (P