Dal Jang, Y.; Lindemann, M. D.; van Heugten, E.; Jones, R. D.; Gyun Kim, B.; Maxwell, C. V.; Radcliffe, J. S. Effects of Phytase Supplementation on Reproductive Performance, Apparent Total Tract Digestibility of Ca and P and Bone Characteristics in Gestating and Lactating Sows. Rev. colomb. cienc. pecu. 2014, 27, 178-193.