GSTM1 and anemia (phenotype): The hematological changes associated with parasitism, such as those caused by Equine parasitic infections like Trypanosoma evansi, Theileria equi, and Babesia caballi, often result in anemia, reflected by reduced red blood cells (RBCs), hematocrit (HCT), and hemoglobin (Hb), alongside increased mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), and mean corpuscular hemoglobin concentration (MCHC), indicating altered red blood cell morphology [25,26,27,28].