Authors : Razieh Mokhtari, Ahmad Reza Yazdani, Mansour Rezaei and Behnam Ghorbani
Abstract: This research was conducted to study the efficacy of different growth promotors on the productive performance and carcass yield of broiler chickens. About 840 sexed male ROSS 308 hybrid chickens were used according to completely randomized design in five treatments and one control. Thus, there were six group of chickens, 1) control diet (with out any promotors), 2) control diet + antibiotic, 3) control diet + probiotic, 4) control diet+prebiotic, 5) control diet+phytobiotic and 6) control diet+symbiotic. The productive indicators evaluated were: feed intake, weight gain, Feed Conversion Ratio (FCR). Also, it was determined the carcass yield and the main portions (breast, thigh and abdominal fat). In all over of current study, there wasn’t any significant difference between treatments in body weight gain but all of them had beneficial effect compare to control. Lowest feed conversion ratio was belong to probiotic group and cause more efficient feed intake. Treatments vs. control increased carcass yield significantly but the difference between treatments was not significant. Breast and thigh was not affected by treatments and there wasn’t any significant difference between treatments and control group. Lowest abdominal fat were seen in antibiotic group. According to the results probiotic and symbiotic appeared to be superior compare to other growth promotors. However, more studies are needed to confirm these findings and other aspects of growth promotors in the broiler diets.
Razieh Mokhtari, Ahmad Reza Yazdani, Mansour Rezaei and Behnam Ghorbani, 2010. The Effects of Different Growth Promoters on Performance and Carcass Characteristics of Broiler Chickens. Journal of Animal and Veterinary Advances, 9: 2633-2639.