Effect of Supplementation of Vitamin D₃ at Varying Dietary Calcium:total phosphorus Ratio in diets Supplemented with Phytase on Growth Performance of Broiler Chicks

A feeding trial was conducted on the broiler to assess the effect of supplementation of vitamin D₃ at four different Calcium:total phosphorus (Ca:tP) ratios of 1:1,1.2:1,1.4:1 and 2:1 in the wheat based diet supplemented with phytase on the growth performance. Eight diets containing phytase were prepared with and without vitamin D₃ supplementation. Ca:tP ratio of the diets were obtained by varying the limestone powder and deoiled rice bran. The effects of supplementation of vitamin D₃ at different Ca:tP ratios supplemented with phytase significantly (P<0.05) affected body weight, weight gain (1–3 week) along with feed intake, Feed conversion ratio, Protien conversion ratio and Calorie conversion ratio during 4–5 and 1–5 weeks of age.