Resumo

SHENG FA, Liao et al. Effect of phytase supplementation to diets for weanling pigs on the utilization of phosphorus and calcium. INCI [online]. 2006, vol.31, n.4, pp.262-267. ISSN 0378-1844.

Four experiments were conducted with weanling pigs to determine the effect of phytase supplementation to four diet types on the apparent total tract digestibility and retention of P and Ca. Phytase was supplemented at rates of 0, 500, and 1000FTU/kg to the four diets. A 20% crude protein (CP) corn-soybean meal diet was used in Exp. 1; a 20% CP wheat-soybean meal diet in Exp. 2; a 20% CP wheat-soybean meal-canola meal diet in Exp. 3; and a 19% CP barley-peas-canola meal diet in Exp. 4. Six barrows were used in each experiment and fed the basal and phytase-supplemented diets according to a repeated 3´3 Latin square design. Each experimental period comprised 14 days. The piglets were fed at 08:00 and 20:00 daily equal amounts of each meal at a daily rate of at least 2.4 times the maintnance requirement for metabolizable energy. Feces and urine were collected from 08:00 on day 8 until 08:00 on day 12 of each experimental period. The results show that phytase supplementation, even to diets supplemented with inorganic P, increases the utilization of P and decreases the excretion in feces. The response of phytase on the utilization of Ca varies with diet composition and is dependent on the dietary Ca content. Phytase supplementation at a rate of 1000 compared to 500FTU/kg diet did not further improve the utilization of P and Ca.

Palavras-chave : Calcium; Digestibility; Phosphorus; Phytase; Weanling Pigs.