Wpływ stadium laktacji i sezonu na zachorowalność krów w warunkach fermowych

From 3270 cases of common diseases registered in 1823 interparturient periods in 949 cows from 5 cowsheds in 1980—87, 30% occurred in the 1st, 16% in the 2nd and 7,2% in the 2rd month after calving. The highest incidence of endometritis (49,2°/o) and mastitis (45,9%>) was found in the 1st month after parturition, interdigital phlegmon (18,7) and septic pododermatitis (16,0'°/o) was noted in the 2nd, and the Rusterholz syndrome in the 3rd month after par­turition. Morbidity was higher in the winter period (No­vember—April) comparing to the summer period (May— —September) both in grazing-stabled and stabled systems. Analysis of calving pattern revealed that increased incidence of diseases in winter concerned only metritis and inter­digital phlegmon in cows in grazing-stabled system.