摘要：This experiment was conducted at College of Agricultural Studies (CAS), Sudan University of Science and Technology (SUST). The trail was planned as complete randomized design during a period of 42 days. The study was carried out to investigate the effect of L47 growth promoter compared with antibiotic on the performance of broiler chicks. A total of ninety day- old unsexed, Ross 308, broiler chicks were used. The study was conducted at farm of Department of Animal Production, College of Agricultural assigned into three treatment groups (A, B and C), and each group was subdivided into three replicates with ten chicks per each replicate. The basal diet was formulated to meat the nutrient needs suggested by the NRC (1994). Group A chicks were supplied with L47 growth promoter through drinking water, (1 ml promoter per 1 liter clean water), while group B was administrated 0.2 gm antibiotic per one liter of tap water, although chicks in group C received clean water without any treatment. Supplementation of antibiotic promoter was stopped at 7 days before slaughter. Body weight and feed consumption were recorded weekly, feed conversion ratio (FCR) was calculated and mortality was recorded when occurred. Collected data revealed that chicks supplied with L47 growth promoter had significantly (P<0.05) higher body weight gain and best feed conversion ratio than those in antibiotics or control groups, although chicks in control group consumed significantly (P<0.05) more feed. Moreover the addition of L47 growth promoter to broiler drinking water improved the dressing percentage of chicks. It would suggest that the supplementation of broiler chick’s drinking water with L47 growth promoter improved broiler performance
