Clinical studies and estimation of teat canal carried out on 3884 quarters of mammaries which also were taken sample of milk to bacteriological investigations. The effects of genotype, the cow age, lactation phase and somatic cells count on occurrence frequency particular types inflammations and mammary contagions, post inflammation changes and domages teats canals were analyzed, using the chi-square test. Somatic cells count in samples of quarter milk was the most factor which had influence on occurrence frequency of particular conditions diseases. Among of recognize mammary diseases was the most subclinical inflammations – bacteriological and non-bacteriological (suitable: 25.6 and 21.5%).

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