Several hematologic parameters of interest in sheep production are studied. A rapid and simple method of blood analysis using whole (no heparinised) blood and a portable clinical analyzer have been used. This kind of analysis can be carried out in the farm, time of analysis being 2 minutes per sample. When results are compared to those in the bibliography, differences among breeds are revealed. Our data also suggest differences between animals within the same breed attributed to their age and physiological status. Values observed in the present study are proposed as reference values for Assaf breed animals.