TY - JOUR T1 - Effects of Changing Vitamin Supplement and Available Phosphorus on Broiler Chicken Performance During Finishing Period TT - اثر تغییر سطح مکمل ویتامینی و فسفر قابل استفاده بر عملکرد نیمچهْ گوشتی در دورهْ پایانی JF - JCPP JO - JCPP VL - 4 IS - 4 UR - http://jcpp.iut.ac.ir/article-1-114-en.html Y1 - 2001 SP - 73 EP - 81 KW - Supplements KW - Non-phytated phosphorus KW - Broiler chicken. N2 - This experiment was conducted to determine the requirements of vitamin supplement and available phosphorus in broiler chickens from 42 to 56 days of age. In a completely randomized design, with a 3×3×3 factorial arrangement, 270 one-day-old commercial broiler chicks were divided into 27 groups (replicates) with 9 treatments, 3 replicates and 10 chicks in each group. Each of the nine diets was given to each treatment from 42 days of age. Levels of vitamin supplement were 0.5, 0.25, 0% and available phosphorus levels were 0.27, 0.22, 0.16%. Diets were isocaloric and isoprotein. Group weight and feed consumption of each replicate were determined after 42 and 56 days of age and daily gain, daily feed consumption and feed conversion were calculated. Percent of carcass components and tibia ash were determined. Results indicated that removal of vitamin supplement from 42 to 56 days of age did not have any significant effects on daily gain, daily feed consumption, feed conversion, live weight, viscera, abdominal fat, carcass weight, wings, neck and back bone. Also, reduction of available phosphorus did not have any significant effect on daily feed consumption, feed conversion, live weight, viscera, abdominal fat, carcass weight, breast meat, femurs, wings, neck and tibia ash. Interaction between vitamin and phosphorus were significant for daily gain, daily feed consumption, live weight, wings, neck and tibia ash (P M3 ER -