Physiological study of cows infected with Theileriosis in Thi-Qar Governorate

This study was conducted in Thi-Qar Governorate to find out the effect of Theileria annulata parasite on the physiological status of red and white blood cells of cattle infected with Theileria. Parasitic infection was diagnosed based on PCR technique and clinical signs. The samples were divided into four groups: (G1) clinically uninfected with a negative PCR test result (the control group (n=30), (G2) a clinically infected group with a negative PCR test result (n=20), (G3) a group is clinically uninfected with a positive PCR test result (n=10), and (G4) clinically infected with a positive PCR test result (n=40). The results showed a significant decrease in the value of red blood cells, hematocrit, hemoglobin, red blood cells, and average hemoglobin. The results of the hematological criteria that included measuring the level of red blood cells (RBC) indicated that there were significant differences in the level of RBC in the second and third and fourth groups. The results revealed a significant decrease in the concentration of hemoglobin (Hb) and hematocrit (HCT) in the second, third, and fourth groups. The current study also recorded a significant decrease in the mean corpuscular volume (MCV) of red blood cells, whose value in the fourth group was 42.66±1.62 compared with the control group. The results also showed a significant decrease in the values ​​of mean corpuscular hemoglobin (MCH) and mean corpuscular hemoglobin concentration (MCHC) in the fourth group (11.59±1.09 and 27.86±2.05) compared with the control group (16.25±0.81 and 33.15±1.81). There were no significant differences in the values ​​of red blood cell distribution width (RDW-SD) and the RDW-Red blood cell distribution width coefficient of variation (RDW-CV) in the fourth group (38.35±5.82 and 16.49±1.28) when compared with the control group (36.87±2.95 and 15.35±1.67). The current study showed a significant decrease in the white blood cells (WBC) in the third (9.3±1.43) and the fourth (4.08±1.34) groups compared to the control one (12.88±1.915).