similar to our results. However, in contrary, addition of 1.0% (thyme or rosemary) or 0.5% Curcuma longa did not decrease total cholesterol and LDL-cholesterol in laying hen blood significantly (Radwan et al., 2008). Similarly, other studies indicated that a diet supplemented with herbal plant(chicory powder; Mansoub, 2011) and 36 mg/kg essential oils (Özek et al., 2011) had no effects on serum glucose of laying hens in line with our results.