Furthermore, Aji et al. (2011) reported the useful influence of onion bulbs on growth yield of broiler
chickens. Goodarzi et al. (2013) reported the using of onion bulbs in broiler diet can decrease triglyceride and
total cholesterol in blood serum. Contrary to these findings, there has been a deficiency of information on the
effect of onion extract on performance and carcass characteristics compared with an antibiotic as growth
exciter in broilers. This experiment was conducted to compare the effect of various levels of onion extract on
growth yield and carcass traits in broilers when used in the drink water.