2. Department of Experimental Sciences and Mathematics, Catholic University of Valencia "San Vicente Mártir", Spain.
3. Department of Animal Medicine and Surgery, Equine Sport Medicine Center, School of Veterinary Medicine, University of Córdoba, Spain.
Background: This study provides data regarding seasonal changes in the hematology of 44 adult Carthusian broodmares (4-17 years old), sampled during 12 months.
Methods: On each animal 24 blood samples were taken every 14 days. A total of 1056 blood samples were analyzed. We measured red blood cells (RBC), hemoglobin (HB), hematocrit (HcT), volumetric indices (MCV, MCH and MCHC), white blood cells (WBC) and subsets, total serum proteins (TSP) and platelets (PLT).
Results: RBC and HcT reached higher values from May to August and PLT, in July and August. By contrast, HB achived the lowest concentrations in September. MCV was lower in May and July, MCH from May to August and MCHM in July and September. The highest TSP concentrations were found in January. WBC, lymphocytes, neutrophils and eosinophils had significantly higher values during the coldest months of the year, from January or February to May, even though the neutrophil/lymphocyte ratio was statistically similar during the whole study.
Conclusions: According to these results, it appears that the hematological profile of the pregnant Carthusian broodmares is subjected to seasonal variations, so it would be a factor to consider in interpreting the haematological profile in the mare.
Keywords: Horse, hematology, seasonal variations, carthusian broodmares, hemoglobin