Effects of phytase on the excretion of N and P in corn-soybean diets for piglets
Two 2×2 factorial balance experiments using 48 Landrace×Rongchang piglets were conducted to study the effects of phytase supplementation in the diets on the N and P of excretion.The experiment lasted for 2 weeks.In each experiment,there were 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-1).Each treatment had 6 replicates with 1 pig.Dietary DE was 14.3 MJ·kg-1 and initial bodyweight of pigs was 9.2 kg for Exp.1,and 12.8 MJ·kg-1,16.9 kg for Exp.2.It is concluded that 750 FTU·kg-1 phytase supplementation reduces percent of P,Ca,N in feces and reduces the quantity excretion of N,Ca,P of units metabolize weight,decreased the percent of P and quantity excretion of P in feces(P0.05,P0.01),decreased the environmental pollution of P.