ANALYSIS OF ASSOCIATIONS AMONG DISEASES IN FRENCH DAIRY-COWS IN 2 CONSECUTIVE LACTATIONS

Associations among diseases in dairy cows were studied on a two-consec utive-lactation basis by means of a longitudinal and prospective study carried out on 24 French herds, Associations between diseases of a gi ven lactation and diseases of the previous lactation were adjusted for breed, parity, milk yield, season of calving, calving interval and ty pe of housing, using multiple logistic regression models with random e ffects. Five of the 12 associations highlighted are recurrences (clini cal mastitis within 5 days after calving, placental retention, lamenes s other than interdigital pododermatitis, reproductive disorders, milk fever). Otherwise, the study confirms the main role of placental rete ntion in associations among diseases.