Objective.

To determine the haematological parameters according to the reproductive status of Peruvian Paso horses in the Province of Lambayeque.

Materials and methods.

The research was conducted on 60 clinically healthy adult horses (> 4 years), without previous drug treatment. Four groups of 15 horses were formed: gelding, entire male, empty mare and pregnant mare. First, a general clinical examination was performed to confirm their good health. Blood was drawn from the jugular vein of all the horses. The samples were processed by haematological analysis and the parameters of the red series (haemoglobin, haematocrit, red blood cells, mean corpuscular volume [MCV], mean corpuscular haemoglobin [MCH] and the mean corpuscular haemoglobin concentration [MCHC] were determined. Likewise, the white series (leukocytes, neutrophils segmented and stacked, basophils, monocytes, lymphocytes, eosinophils) and the thrombocytic series were processed and the unit range determined. Manual methods, mathematical formulas and the Drabkin method were used in the clinical pathology laboratory. The Kruskal Wallis Statistical test was applied and consequently the mean, standard deviation and ranges of variables were obtained.

Results.

No significant statistical differences were found in the white, red and thrombocytic series according to sex or reproductive status, except the number of basophils was higher in the entire males.

Conclusions.

The haematological parameters according to the reproductive status of the Peruvian Step horse are within the normal ranges (as per the literature pertaining to this area). However, the number of lymphocytes was much lower.

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