THE EFFECT OF MICROBIAL PHYTASE SUPPLEMENTATION IN FEED MIXTURE ON PHOSPHORUS AND CALCIUM UTILIZATION IN GROWING PIGS

The effect of microbial phytase in feed mixture on apparent digestibil ity and phosphorus and calcium retention was investigated in seven pig s (3 x 7) at the live weight 35-57 kg in three balance periods. Simple feed mixture - soybean meal and barley - was given at a dose of 3.5% of live weight. The mixture did not contain any source of mineral phos phorus. The experimental impacts O - without phytase supplementation, N - microbial phytase N supplementation 494 PU/kg of mixture and A - m icrobial phytase A supplementation 508 PU/kg of mixture served for the assessment of microbial phytase supplementation effect and for compar ison of the two types of phytase. Apparent digestibility of phosphorus and calcium was significantly higher (P < 0.05) in pigs with phytase supplementation N and A compared with pigs O. The relative increase of apparent P digestibility amounted to 26% in N phytase and to 20% in A phytase compared with O. In the same way, P and Ca retention rates we re influenced significantly (P < 0.05) in pigs A and N compared with p igs O. An increase in mean daily P retention amounted to 0.95 and 0.56 g in pigs N and A, respectively, compared with pigs O. P content in f aeces was also positively affected as a result of phytase application.