The Effects of Different Levels of Costmary (Tanacetum balsamita) Medicinal Plant onPerformance, Egg Traits and Blood Biochemical Parametersof Laying Hens

This experiment was conducted to evaluate the effects of different levels of costmary(Tanacetum balsamita)medicinal plant on performance, egg traits, and blood biochemical parameters of laying hens. Hundred-eighty of Hi-line laying hens (W 36) from 46 until 58 weeks of age were used in a completely randomized design in five treatments and three replicates (12 birds per replicate). The treatment groups consisted of a control group (1) with no costmarysupplementation, and 2, 3, 4 and 5 experimental groups with 0.5%, %1, 1.5% and 2% of costmary,respectively. Using different levels of costmarysignificantly affected the performance, egg traits and blood biochemical parameters of laying hens (P