The objectives of the experiment were to investigate the effects of different nutritional manipulations on the performance and carcass traits of broiler chickens. Seven treatments were used: control, super pre-starter diet (25% P) during the first three days of age, mix. of 2g of both yeast and glucose anhydrous, 2g synbiotic/Kg feed, 20g/500 ml water of synbiotic spraying, mix. of 2g synbiotic/Kg feed+20g/500 ml water of synbiotic spraying and mix. of super pre-starter diet (25% P) and 2g synbiotic/Kg feed. Two hundred eighty, one day old of broiler chicks were randomly selected in experiment lasted in 6 weeks of age. Body weight, feed consumption, body weight gain, feed conversion ratio and some carcass traits were studied. The results indicated that there was significant (P<0.05) increase in body weight due to super pre-starter supplementation at 4, 5 and 6 weeks of age. Body weight gain, feed consumption and feed conversion ratio were significantly (P<0.05) improved during the periods from (3-6) and (0-6) weeks of age. Dressed carcass percentage was increased significantly (P<0.05) in chicks fed mix. of synbiotic in feed and spray compared to the other treatments, the increased was 79.77% compared to control (75.14%). Breast% was increased in chicks fed mix. of yeast and glucose anhydrous and also in chicks fed symbiotic in feed.
Results concluded that using of super pre-starter diet during the first 3 days of age at level of (25% P) improved growth performance of broiler chicks