Comparison Of Efficiency Of Phytase Applied In Three Typical Growing Swine Diets

The objective of this study is to determine the efficacy of P releasing from phytate and determined the phosphorus availability of phytase for 3 type diets which represent different source of feedstuff in China. The study foucus on P availability of different constitution of diet with methods desicribled as follows.Corn-soybean ,brown rice-soybean and wheat-soybean has been formulated as low-P(available P lower than NRC recommended ) basal diet, added 750FTU/kg phytase in 3 basal diets to form 6 dietary treatment. fifty-four crossbred growing pigs (DurocxLandracexYork) weighted 57±1.8kg were alloted to the 6 groups of different dietary treatments randomly. Evaluate phytase efficacy in 3 different types of diet by determined animal growing performance, serum P, AKP and fecal P of experimental swine.The results showed that:1) Animal growing performance of experimental swine were retarded because of deficiency of available P in 3 types of diet, but supplementation of phytase did not improve animal growing performance of pigs in this study: the ADFI and ADG were decreased by addition of phytase. F/G decreased significantly after supplementation of phytsase(P<0.05) while increased in corn treatment after supplementation of phytase(P>0.05).2) The levels of serum P has not varied significantly because of supplementation of phytase in three types of basal diets.3) Fecal P were decreased in all 3 types of diets by supplementation basal diet with phytase, decrease value is 21.8%,15.4%,9.7% in wheat, brown rice and corn basal diet, respectively.