SUMMARY
From 40 healthy sheep breeding in good conditions of hygiene and feeding belonging to particular herds from the West side of the country were been taken blood samples in most important seasons of the year: in spring, before pasturage period and in autumn, after pasturage period. Sheep were been periodically preventive treated against parasites and were clinically healthy. Were been followed haematological parameters like haemogram (number of erithrocytes, haemoglobin, haematocrit, erithrocytic indexes), leucogram (number of leucocytes, leucocytic formula) and those blood biochemicals indexes (total seric proteins, proteic fractions, glucose, uric acid, GPT, creatinin, calcium, phosphorus, magnesium). The obtain values in spring season were smaller in comparison with those from autumn as a result of less favourable conditions in winter, when sheep can't have the same benefits like in warm season, with high quality fresh food and life conditions. This fact is emphasized in these sheep obtained productions.