Effect of Phytase Dosage and Source on Growth Performance and Bone Development of Nursery Pigs11Contribution No. 05-276-J from the Kansas Agricultural Exp. Sta., Manhattan.

1995, AOAC Augspurger, 2004, High dietary phytase levels maximize phytate-phosphorus utilization but do not affect protein utilization in chicks fed phosphorus- or amino acid-deficient diets, J. Anim. Sci, 82, 1100, 10.2527/2004.8241100x Augspurger, 2007, An Escherichia coli phytase expressed in yeast effectively replaces inorganic phosphorus for finishing pigs and laying hens, J. Anim. Sci, 85, 1192, 10.2527/jas.2006-340 Augspurger, 2003, Efficacy of an E. coli phytase expressed in yeast for releasing phy-tate-bound phosphorus in young chicks and pigs, J. Anim. Sci, 81, 474, 10.2527/2003.812474x 2000, BASF Crenshaw, 1986, Reliability of dietary Ca and P levels and bone mineral content as predictors of bone mechanical properties at various time periods in growing swine, J. Nutr, 116, 2155, 10.1093/jn/116.11.2155 Crenshaw, 1981, Bone strength as a trait for assessing mineralization in swine: A critical review of techniques involved, J. Anim. Sci, 53, 827, 10.2527/jas1981.533827x Grandhi, 2001, Effect of supplemental phytase and ideal dietary amino acid ratios in covered and hulless-barley-based diets on pig performance and excretion of phosphorus and nitrogen in manure, Can. J. Anim. Sci, 81, 115, 10.4141/A00-051 Jendza, 2006, Efficacy and equivalency of an Escherichia coli-derived phytase for replacing inorganic phosphorus in the diets of broiler chickens and young pigs, J. Anim. Sci, 84, 3364, 10.2527/jas.2006-212 Kies, 2006, Effect of graded doses and a high dose of microbial phytase on the digestibility of various minerals in weaner pigs, J. Anim. Sci, 84, 1169, 10.2527/2006.8451169x Littell, 1996 1998, NRC Olukosi, 2007, Supplementation of carbohydrases or phytase individually or in combination to diets for weanling and growing-finishing pigs, J. Anim. Sci, 85, 1702, 10.2527/jas.2006-709 Omogbenigun, 2003, The effect of supplementing microbial phytase and organic acids to a corn-soybean based diet fed to early-weaned pigs, J. Anim. Sci, 81, 1806, 10.2527/2003.8171806x Sands, 2001, Phosphorus bioavailability, growth performance, and nutrient balance in pigs fed high available phosphorus corn and phytase, J. Anim. Sci, 79, 2134, 10.2527/2001.7982134x Tokach, 1997, Starter pig recommendations. Kansas State Swine Nutrition Guide Veum, 2006, A genetically engineered Escherichia coli phytase improves nutrient utilization, growth performance, and bone strength of young swine fed diets deficient in available phosphorus, J. Anim. Sci, 84, 1147, 10.2527/2006.8451147x Zhang, 2000, Comparison of phytase from genetically engineered Asper-gillus and canola in weanling pig diets, J. Anim. Sci, 78, 2868, 10.2527/2000.78112868x