Improving phosphorus availability in broiler diets based on corn-soybean meal using microbial phytase.

The effect of the microbial phytase in nutrition of broilers on carcass and meat quality were observed. Trial was carried out on 300 Arbor Acres broilers of both sexes divided into six groups. The broilers in control groups (K and K+) were fed with complete mixtures of standard raw materials and chemical composition, in which dietary available phosphorus (AP) level was formulated at the level of 0.46%. In diets for broilers in the experimental groups, by reducing (O-I and O-I+) and complete excluding dicalcium phosphate (O-II and O-II+), the AP in mixtures was reduced to 0.25% and 0.10%, respectively. Diets for broilers in the experimental groups (K+, OI+ and O-II+) were supplemented with phytase. During the experiment, that lasted 42 days performances were investigated. At the end of the trial dressing percentages (yields) and carcass conformation measures were monitored. Reduction of the dietary TP and AP level for experimental broilers induced lower body mass, gain and feed consumption as well as higher fed conversion. However, by introduction phytase into diets negative effects of P reduction were, to some extent, alleviated. The obtained results show that dressing percentages of broilers from the experimental group varied less comparing to the broilers from the control group. Supplementation of phytase into diets increased the share of the breast part and waiter thigh in chicken carcasses.