Effect of the Phytase Supplementation in Diets for Broilers Chickens on Growth and Phosphorus Absorption

Phosphorus (P) is a mineral required by all domestic animals to meet its requirements. Phytase is an enzyme that liberates phosphate by hydrolysis from phytate, to make it more available for absorption in gastrointestinal tract of not-ruminant, like birds and pigs. Experimental diets used with phosphorus and phytase were evaluated to estimate productive parameters of broiler chickens and simultaneously to evaluate as a test or absorption, with the phosphorus in the diets. In 1st trial, feed intake, daily gain and feed efficiency were measurement in 6 treatments diets included 3 phosphorus levels (0, 50 and 100%, of requirements) and 2 phytase (0 and 600 Units). Feed intake was increased by phosphorus (p<0.005) and phytase (p<0.001). Body weight gain was elevated by effect of phosphorus (p<0.001) and phytase (p<0.001) and their interaction (p<0.001). Phosphorus (p<0.04) and phytase (p<0.03) influenced on feed efficiency and an interaction was observed (p<0.05). In 2nd test, phosphorus absorption apparent, P intake was influenced by phosphorus level (p<0.001) and phytase (p<0.001). Phosphorus excretions also was increased by P level (p<0.01) and phytase contents (p<0.001) in grams per day. Phosphorus retention was influenced by phosphorus (p<0.001), phytase (p<0.001) and their interaction (p<0.003). Phosphorus content influenced (p<0.043) on percent tibias-bones ash and by phytase (p<0.003). In content by percent of tibias phosphorus was increased by P level (p<0.036), although not for phytase (p>0.05). Phytase aid to use phosphorus of broilers diets and makes efficient the feed intake and the phosphorus increase in bones.