Two experiments were conducted to investigate the effects of replacement of peppermint (Lamiaceaementhapiperita)bynettle (Urticadioica) in mixture of different levels of medicinal plants on carcass traits in female and male broilers. In each of these experiments 240 broilers (Ross- 308) from 1- 42 days of age in two breeding periods including starter (1-21) and grower (22-42) days of age were used in a completely randomized design in 4 treatments and 3 replicates (with 20 birds in each replicate). The medicinal plants used in first experiment included zizaphora, mentapulagum and peppermint in second experiment peppermint was replaced by nettle. The results showed that there were significant differences between treatments in experiments about the carcass traits of female and male broilers (p<0.05). In the first experiment in female broilers the highest percent of carcass and breast (71.22) and (35.89) were observed in 3th experimental group, whereas the highest percent of gizzard and thigh (3.09) and (30.85) were observed in control group. In the second experiment in female broilers like the first experiment the highest percents of carcass and breast (73.63) and (34.89) were observed in 3th experimental group and the lowest percent of abdominal fat (3.7) was observed in 4th experimental group. About male broilers in the first experiment the lowest percent of abdominal fat (1.81) was observed in 3th experimental group and the highest percent of it (3.5) was observed in the control group. In the second experiment there was not any significant difference between treatments about carcass traits.
