Effects of Phytase Supplemented in Diets on Growth Performance and Nutrient Availability of Growing Pigs

In present experiment thirty-six growing piglets were conducted to study the effects of phytase substituted Calcium phosphate in diet on the growth performance,nutrient availability,serum biochemical parameters and excretion of feces phosphrous.There were 2 treatments with control group、experiment group,and high-p diet was fed to control group,low-P with adding phytase was fed to experiment group.Each treatment had 3 replicates with 6 pigs per pen.Pigs fed the low-P diet adding phytase improved ADG by 16.69%(P0.05),reduced F/G by 12.84%(P0.05).Adding phytase in low-P diet improved apparent digestibility of DM、CP、Ca、P、GE by 3.28%、5.17%、15.30%、15.58%、3.27%(P0.05),respectively.Biochemical parameters were not affected by adding phytase in low-P diet.The concentration of serum P were tended to increase(P0.05) in pigs fed low-P with adding phytase diet,but concentration of serum Ca and the enzymatic activity of alkaline phosphatase in serum were tended to decrease(P0.05).The excretion of feces P was decreased 28.01%(P0.05)、feces N was decreased 25.19%(P0.05) by fed low-P with adding Phytase diet.