Effects Of Adding Phytase To Diets In Different Condition On The Growth Performance And Nutrients Utilization In Both Broilers And Ducks

This paper was conducted to study adding different dose phytase diets containingdifferent condition on the growth performance and nutrients utilization in both AAbroilers and cherry valley ducks, and aimed to provide theory basis for phytaseapplication in poultry production.A total of1080ducks and broilers were selected to study the effect ofphytasesupplementation in diets with different condition on the growth nutrientsavailability and serum biochemical indexes. The study was assigned randomly to nineexperimental treatments, which included one dietary treatment with high non-phytatephosphorus as a positive control and other eight low-NPP dietary treatment. The laterwas assigned to a2×4factorial arrangement. Effects of two factors,phytatephosphorus (0.24g/kg,0.34g/kg in starter) and phytase (0,500,1000,1500FTU/Kg) were determined. Each treatment had6replicates with10ducks orbroilers per pen. The results indicated that:(1) the FBW,ADFI,ADG as well as thegrower feed conversion (F/G) were highly improved by phytate and phytase. Thediets with low-NPP was superior to the higher treatments(P<0.05),and a significantinteractions between phytate and phytase level was both observed(P<0.05). the lowphytate adding500,1000,1500FTU/Kg phytase all reached the positive control level.(2) Increasing phytase dose could highly improve the availability of Ca, P in starterperiod. The availability of calcium in low phytate diets was significantly higher thanthe high treatments (P<0.01), the phosphorus availability was same in low phytatediets. The high and low phtate diets adding phytase both had no significantlyeffectson AME availability.(3)The diets adding phytase also could significantly improve theavailability of calcium and phosphorus(P<0.01),Calcium availability in the highphytate diets was significantly lower than the lowphytate diets, but the availability ofphosphorus is opposite in the low phytate diets. The AME of availability in lowphytate was lower than in the phytate diets.Conclusion: The date suggested adding phytase in low-NPP diets can significantly improved both ducks and broilers feed intake and growth rate，availability of calcium and phosphorus. In the broilers experiment, the lowphytatediets was superior to the high phytate diets. In the ducks experiment, the highphytatediets was superior to the low phytate diets except the phosphorus availability.