The aim of this study was to identify the relationship between clinical mastitis and various factors such as physical conditions and teat-health control measures undertaken at dairy-farm enterprises and the proprietor’s education and teat-health awareness levels. The study also aimed to determine the prevalence rate of clinical mastitis. Research material consisted of 1838 head of cattle from 68 dairy cattle enterprises among 1079 enterprises affiliated with the Samsun province Cattle Breeders Association. Enterprises were separated into three groups by size as either small (7-20 head), medium (21-30 head), or large (31-94 head). Data was collected using a questionnaire. Barn type was found to vary significantly among the groups (P<0.05). The prevalence of mastitis was found to be 7.293% among enterprises and 1.690% per animal in the same enterprises. This rate did not vary significantly among groups (P<0.05).