عنوان مقاله [English]
The aim of this study was to evaluate the effects of in-ovo injection of oil-extracted propolis on hatchery performance, blood cell count and carcass characteristics of broiler chicks. For this purpose, on the 15th day of incubation, 324 Ross 308 broiler chicken eggs were weighed and completely randomized to six experimental groups with three replicates and each replicate containing 18 eggs and injected into amniotic fluid. Experimental treatments consisted of two types of negative control without injection, positive injection of 60 mL distilled water and injection of 4 levels (150, 300, 600 &1200 ppm) from oil-extracted propolis to amniotic sac. The results showed in-ovo injection of oil-extracted propolis on day 15 of incubation did not show any effect on hatching percentage, hatching weight and the ratio of the weight of hatching chicks to egg weight. While 1200 ppm of in-ovo injection of oil-extracted propolis increased the ratio of the weight of hatching chicks to egg weight compared to control group. In-ovo injection of oil-extracted propolis at different levels could not affect the concentration of total white blood cell, heterophile, lymphocyte, monocyte and eosinophil blood in broiler chicks. The carcass weight, heart rate, spleen and tissue stockings were not affected by in-ovo injection of oil-extracted propolis at 42 days of age. So, these results of this study suggest that in-ovo of oil-extracted propolis cannot improve the status of hatching percentage, blood cell count and carcass characteristics of broiler chicks.