This experiment was conducted in the field of Poultry birds belonging to Department of Animal Production, College of Agriculture, Al-Qasim Green University in order to study the effect of adding different levels of crushed laurel leaves (Laurus nobilis) to the diet of broiler chickens on some physiological traits for blood. A 180 unsexed broiler chickens (ross 380 strain), with one-day age were used, where they were randomly divided into four treatments, with a rate of 45 birds per treatment and each treatment consisted of three replicates (15 birds per replicate). The treatments of experiment were as follows: First treatment (control) without adding crushed laurel leaves to the diet, second treatment: Adding crushed laurel leaves with amount of (1 g / kg feed), third treatment: Adding crushed laurel leaves with amount of (2 g / kg feed) and treatment Fourth: Adding crushed laurel leaves with amount of (3 g / kg feed). The experiment included the following traits: Red blood cell count, white blood cell count, Haematocrit, hemoglobin concentration, White Blood Cell Differential Count, estimating the mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH) and the mean corpuscular hemoglobin concentration (MCHC). The results indicated that adding laurel leaves with the rate of (2 and 3 g / kg feed) led to significant improvement (p <0.05) in the red and white blood cell counts, hemoglobin concentration, Haematocrit, the value of mean corpuscular volume (MCV) and mean corpuscular hemoglobin concentration (MCHC), a significant decrease (p <0.05) in the Heterophil/lymphocyte ratio (H/L ratio). From the present experiment, it is concluded that adding laurel leaves with the rate of (2, 3 g / kg feed) to the diet can lead to improve some blood parameters for broiler chickens.

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