Effects of added phytase on growth performance, carcass traits, and tibia ash of broiler chickens fed diets with reduced amino acid, crude protein, and phosphorus concentration

This experiment was conducted to investigate the effect of phytase supplementation in diets reduced amino acids ( AA ), crude protein CP and phosphorus P ) on growth performance, carcass traits, tibia ash broiler chickens. A total 2,240 unsexed Ross 308 chickens were used 56 floor pens with 40 birds each fed one eight dietary treatments seven replicates until 35 d age. positive control PC diet AA/CP level by 2, 4, 6% without 1,500 FTU phytase/kg. Starter, grower, finisher from 1 10, 10 25, 25 35, respectively. For period, no significant interaction effects between detected for any measured traits. The ADG, ADFI, weight, breast weight lower FCR higher compared when more than 2%. Phytase increased final BW, weight. Tibia measurements showed that adequately supplied digestible all treatments, although calcium phytase-supplemented diets. enabled feeding mineral phosphate supplements grower results phytase/kg diminished growth-decreasing at reduction steps.