Resumen de Uso de una nueva fitasa en alimentación de pollos de engorde y lechones: Efectos sobre la digestibilidad y excreción de minerales

J.A. Cerisuelo, M. Cambra López, Ernesto Ángel Gómez Blasco, P. Ferrer, B. Farinós, P. Añó, R. Marqués González, I. Salaet, R. Alique, Juan José Pascual Amorós

• The effects of inclusion of a new phytase (produced by Pichia pastoris from a cloned gene of Serratia odorifera) in broiler (Exp.1) and piglet (Exp. 2) feeds on mineral (P and Ca) utilization and retention were studied. A total of 96 male chicks (Ross) and 36 male pigs of 28 and 46 days of age, respectively, were used. Dietary treatments consisted in the administration of 6 diets incorporating different mineral levels and enzyme doses: C+ (commercial levels of Ca and P; without phytase), C- (low levels of P; without phytase), 250 (C- + 250 IU phytase/kg), 500 (C- + 500 IU phytase/kg), 1000 (C- + 1000 IU phytase/kg),10000 (C- + 12000 IU phytase/kg). Mineral balance and retention were measured from 35 to 38 (Exp.1) and 60 to 64 days of age (Exp. 2). In Exp. 2, the left tibia was removed on day 49 (6 animals per treatment) to determine mineral retention. Calcium and P utilization and retention rates were higher (P<0.05) in treatments with phytase compared with C-. The results of this study indicate the inclusion of 250 units of phytase/kg feed might offer advantages in terms of mineral digestibility and retention both, in broilers and pigs