INFLUENCE OF MICROBIAL PHYTASE SUPPLEMЕNTATION ON THE GROWTH PERFORMANCE AND NUTRIENT UTILIZATION OF BROILER CHICKENS OFFERED CORN-SOYBEAN AND CORN-WHEAT-SOYBEAN BASED DIETS

D. Chotinsky, E. Stancheva, Ch.Stanchev, D. Abadjieva, I. Denev

Abstract: Two experiment were conducted to evaluate the effect of dietary addition of microbialphytase on the performance and utilization of nutrients in broiler chickens fed low phosphorus diets without inorganic phosphates. In the first experiment broiler chickens were fed with corn-soybean meal formulated to be adequate or inadequate phosphorus during the starter and growing periods. Four of the diets were supplemented with phytase at 125, 250, 500 and 700 phytase units/kg. Performance and efficiency were decreased when the low phosphorus diets were fed at the end of experiment. Adding phytase to the low phosphorus diets did not restore performance to levels that approached those of chickens fed the adequate phosphorus diet. In the second experiment experimental chickens were fed with corn-wheat-soybean meal formulated to be adequate or inadequate phosphorus during the starter and growing periods. Two of the diets were supplemented with phytase at 250 and 500 phytase units/kg. Performance of broiler chickens decreased and efficiency increased when the low phosphorus diets were fed. Dry matter in the in the organism of the chickens change when the low phosphorus diets were fed. Protein content did not change, but a tendency was observed for a decrease in fats in the carcasses. The retention of protein and energy not change significantly.

Keywords: body weight; chicken broilers; phytase; retention of protein and energy

Date published: 2019-03-21