EFFECT OF ADDITION OF PHYTASE TO A MAIZE-SOYBEAN MEAL DIET ON WEANED PIG'S PERFORMANCE,NUTRIENTS DIGESTIBILITY AND SERUM PARAMETERS

Weaned pigs(n=40;4 weeks old and average body wieght 7.5±0.5kg)were used in a 9-week experiment to evaluate the efficacy of phytase(300IU/kg) on performance,nutrients digestibility and serum parameters.The results show that addition of phytase reduced feed consumption(P0.06),but average daily gain and feed conversion rate were not affected by feeding phytase(P0.05).Apparent ileum digesibilities of DM,gross energy,N and amino acid were not affected by phytase supplementation(P0.05),whereas apparent ileal digestibilities of Ca and P increased(P0.05 or P0.12)with increasing phytase supplementation.Apparent ileum digestibilities of some amino acids were improved(P0.05) by addition of phytase include,by+11.7%(His),+2.7%(Ile),+6.2%(Leu),+5.4%(Lys),+1.1%(Met),respectively.Addition of phytase also decreased serum glucose at 42d(15.2%,P0.07),serum urea nitrogen(22.2%,P0.12) and alkaline phosphatase concentrations(29.5%,P0.05).Addition of phytase improved serum T3,T4 and insulin concentration levels(15.6%,P0.05;4.4%,P0.05;10.9%,P0.05) at the age of 42 day.It is concluded that addition of phytase to a corn-soybean meal diet of weaned pigs have effects on feed intake,ileum nutrient apparent digestibility and basal metabolism level.