The aim of this study was to evaluate the influence of chronic intestinal parasitism on hematological parameters and peritoneal fluid. It was done by comparing these features in horses used for traction naturally parasitized and after the administration of anthelmintic. Twenty-one horses, between two and nineteen years of age, of mixed breed and with results of parasitological examination of more than 300 eggs per gram of feces were studied. Physical assessment and samples of feces were conducted, as well as blood and peritoneal fluid in the two phases of the experiment (D0 and D15). Antiparasitic treatment in D0 has also been done. The peritoneal fluid was evaluated for physical and biochemical features, and also total count of nucleated cells (TCNC) and cell differentiation. The blood was determined for erythrocyte, leukocyte, plasma total protein, glucose and plasma fibrinogen, and alkaline phosphatase (ALP) levels. The analysis of these parameters showed no significant difference between parasitized animals and after administration of anthelmintic except for TCNC values, segmented neutrophil count and degree of turbidity in peritoneal fluid. The averages remained within the reference ranges, except the TCNC in the peritoneal fluid in D0. In the peritoneal fluid there was a predominance of segmented neutrophils, followed by macrophages, lymphocytes and eosinophils in both time points. A trend was observed in erythrocyte frame to keep close to the lower limits and mild leukocytosis in D0. Parasitic infection of the animals studied was predominantly moderate, which offered minimal clinical risks. After that, it can be affirmed that the TCNC, absolute segmented neutrophil count and targeted degree of turbidity in peritoneal fluid are influenced and can be considered useful diagnostic and prognostic tools in chronic intestinal parasitism.
equidae; intestinal parasitism; hematological evaluation; parasitological evaluation; peritoneal fluid