关键词: 植酸酶, 仔猪, 能量利用率, 蛋白质利用率

Abstract: Two 2×2 factorial balance experiments by using 48 Landrace×Rongchang piglets are conducted to study the effects of phytase supplementation in the diets on Energy and Protein utilizations. In each experiment, there are 4 treatments with 2 dietary levels of available phosphorus(AP)(0.36% and 0.26%) and 2 levels of phytase supplementation(0 and 750 FIU/kg). Each treatment had 6 replicates of 1 pig. Dietary DE is 14.3 MJ/kg and initial bodyweight of pigs is 9.2 kg for Exp.1, and 12.8 MJ/kg, 16.9 kg for Exp.2. The experiment lasts for 2 weeks. It is concluded 750 FTU/kg phytase supplementation enhances the utilization of dietary protein, but has no effect on energy utilization. Protein utilization for pigs fed 0.26% AP diets added with 750 FTU/kg phytase are higher than those in the 0.36% AP diets. Decrease of dietary levels of energy reduces energy and protein utilization. Decrease of dietary levels of AP reduces protein utilization.

Key words: phytase, piglets, energy utilization, protein utilization