The purpose of this study was to investigate the influence of dairy herd type (small-type farms, big dairy herds), milking system (milking parlor, milking bucket, milking pipeline) and maintenance system of cows (free stalls, tie stalls) on the presence of yeast mastitis in cows. The studies included the cases of mastitis mycotica diagnosed in the Department of Animal Hygiene and Environment in the years 1996-2009. In total, 1982 cows of Polish Holstein-Friesian breed, 60 cows of Simental breed, and 177 cows of the Montbeliard breed were examined. Animals belonged to 34 dairy herds in various regions of the Poland. The percentage of cows and quarters with yeast mastitis in small-type farms was (respectively) 3.57%, and 1.05% while in the large dairy herds only 0.65% and 0.18%. Differences were statistically significant (p ≤ 0.05). An average 3.74% of cows and 1.11% of the quarters showed mastitis mycotica in farms with a tie stall maintenance system, while in the free stall maintenance system (respectively) 0.82% and 0.22%. Differences were statistically significant. The occurrence of yeast mastitis due to a milking system was the following (cows and quarters): 5.47% and 1.66 for farms using milking bucket, 2.21% and 0.69% in dairy farms with milking pipeline and 0.71% and 0.2% in the dairy farms with milking in a parlor. Statistically significant differences were found between the type of milking bucket and milking parlor. The studies show that yeast mastitis (in subclinical and clinical form) mostly appeared in small-type dairy farms, with milking buckets and tie stalls.
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