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The research was conducted to investigate the effect of different levels of rosemary powder supplementation on some productive traits of broiler chicken ross strain. Three hundred unsexed broiler chicks of one-day-old were equally divided into five groups, 2 replicates per group (30 chicks per replicate). Chicks were fed on starter diet from one-day-old until end of three weeks then replaced to finisher diet from the beginning of four weeks until the end of six weeks, starter and finisher diet supplemented with four ratios from rosemary powder 0, 0.5, 1, 1.5 and 2% which represented experimental groups.
Results showed a significant superiority (P≤0.05) in average live body weight, weight gain, feed conversion ratio and dressing percentage in birds supplemented with rosemary powder as compared with control group at 3 and 6 weeks of birds age. Moreover, supplementation of rosemary had significantly (P≤0.05) decreased mortality ratio in experimental groups as compared with the control group.
It can be concluded that supplementation of rosemary powder to the diet had a profound effect to enhance productive traits of broiler chicken ross strain.