Abstract
The article view on the effect of the extensive breeding conditions on health state of sheep in foothill areas of the South Bohemian region. Very negatively affects the health of sheep presence of parasitic infection in the herd. Among the factors indicative of the normal process of physiological functions and thus the health of sheep include haematologic and biochemical parameters of blood. Samples of blood and excrements were collected and divided by breeds of sheep and sampling time. It was done Faeces examination of excrements and was determined number of erythrocytes and leukocytes, haematocrit, haemoglobin, content of zinc and copper in blood and differential leucocytes count. Haematological and biochemical parameters were observed for all samples in the physiological range, despite the simultaneous parasitic contagions of examined animals.