Investigation the Effects of Using of Zizaphora (Thymyus valgaris), Peppermint (Lamiaceae menthapiperita), Menta Pulagum (Oreganum valgare) Medical Plants on Performance, Egg Quality, Blood and Immunity Parameters of Laying Hens

This experiment was conducted to evaluate the effects of using of zizaphora (Thymyus valgaris), peppermint (Lamiaceae menthapiperita), menta pulagum (Oreganum valgare) medicinal plants on performance, egg quality, blood and immunity parameters of laying hens. This experiment was conducted in a completely randomized design with 288 of Hy line (W-36) laying hens in 8 treatments and 3 replicates (with 12 hens in each replicate) for 12 weeks from 38- 50 weeks of laying period and included: 1) control group without using any medical plants, group 2) using 2% of zizaphora, group 3) using 2% of peppermint, group 4) using 2% of menta pulagum, group 5) using 2% of (zizaphora and peppermint), group 6) using 2% of (zizaphora and menta pulagum), group 7) using 2% of (peppermint and menta pulagum) and finally group 8) using 2% of menta pulagum. The results showed that the use of different medical plants mix had significant effects on performance, and egg quality of laying hens (p<0.05). The highest amount of egg production percent (86.5), egg mass (51.15 g) and better feed conversion (1.99) were observed in group four with using 2% of menta pulagum and the highest amount of feed intake (102.79 g) was observed with using 2% of peppermint whereas the highest haugh unit (92.35) and yolk color index (4) were observed in group four with using 2% of menta pulagum and the lowest level of triglyceride (1163 mg.dl) was observed in group three with using 2% of Lamiaceae menthapiperita.