This study aims to complete the direction of experimental research in determining the effect of flaxseed oil doses on the fertility of Awassi ewes, as well as some important blood parameters to clarify the animal's physiological state during the duration of the experiment. This study was conducted in the animal field (College of Agriculture - Tikrit University) for 76 days (16 days before and 60 days after fertilization). 2-3 years have an average live weight of 51.74 kg, and the ewes were randomly divided into three treatments (each treatment was nine ewes). The three treatments were given doses of flaxseed oil at the rate of 0, 6 and 8% / kg of feed, respectively. The results showed that there was no significant difference (P≤0.05) between the treatments in the ewes' weights and physical blood characteristics during the experiment period, while it was noted that the fertility rate of the second and third treatments amounted to 66.66% for each of them, over the first treatment (55.55%). In addition, the second treatment was significantly (P≤0.05) superior in blood globulin concentration over the rest. In contrast, the third treatment was significantly (P≤0.05) superior in triglyceride concentration (62.66) mg/dL, and the first treatment showed a significant (P≤0.05) superiority. In glucose concentration (70.33) mg/dL. The following characteristics were not significantly different in total protein, albumin, urea, creatinine, ALT and AST enzymes, as well as no significant difference between treatments in the concentration of estrogen and progesterone hormones. Keywords: flaxseed oil, Awassi ewes, fertility

The goal of this research was to determine the effects of various doses of flaxseed oil on ewe body weight, growth characteristics, and selected biochemical and hormonal blood characteristics. This research was carried out in the animal science department at the University of Tikrit’s College of Agriculture between October 6th, 2022, and September 1st, 2022. There were a total of 17 female Awassi sheep, ages 1-2, with an average live weight of 56.41 kg, and they were randomly assigned to one of three groups. To the ewes, flaxseed oil was administered at a rate of 0%, 6%, and 8% of the dry matter weight in the three different groups. The ewes were grazing daily, in addition to providing a supplementary diet at the level of 2.5% of body weight, consisting of 14.98 protein and 14.22 MJ/kg dry matter as energy. At the end of the experiment, there were no significant differences (P>0.05) between the treatments in ewes’ weights, the percentage of packed blood cells, the number of white blood cells and platelets, and the values of total protein, albumin, urea, and creatinine, while the control treatment was the least significant (P≤0.05). of the second and third treatments, which had the highest numbers of red blood cells (5.79, 6.61 and 7.72) 106cells/ml3 and hemoglobin (9.06, 9.80 and 10.20) mg/dl, respectively. While a significant decrease (P≤0.05) was, observe for the activity of AST, ALT and triglyceride enzymes for the third treatment compared to the control treatment. The third treatment was significantly superior (P≤0.05) in the value of blood globulin, glucose and cholesterol 1.90 g/dl, 66.66 and 84.00 mg/dl, respectively.