The aim of the studies was to analyze the influence of successive lactation, lactation period, daily milk yield and season on somatic cell count in milk of montbeliarde cows. The research included the results of 7 187 of experimental milkings made in the years 2006–2010. It was found that the animals produced milk of high cytological quality. Average somatic cell count scored 465 thous. ·ml^–1, and 76.3% of samples contained to 400 thous. ·ml^–1 of cells maximum. Somatic cell count and the share of samples indicating worse cytological quality of milk increased in successive lactation and lactation period, whereas a decrease of this parameters with an increase of daily milk yield and in winter season were observed. It was also found that an udder’s care is very important element of looking after cytological quality of milk, regardless of the age of animals, lactation period, daily milk yield and season. Within each of these factors, milk samples indicating health problem of udders were found.

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