INCIDENCE OF CLINICAL MASTITIS IN DAIRY CATTLE

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Abstract
Incidence of clinical mastitis in 821 lactations of Holstein line cows (H) and in 581 lactations of synthetic line cows derived from Ayrshire females (A) housed under intensive management was studied to examine effects of sire, parity, and month of calving. Ten traits were examined for each lactation of a cow: (1) number of separate quarter cases, (2–5) number of separate cases in each quarter, (6) presence or absence of infection in any quarter, (7–10) presence or absence of infection in each of the four quarters. Incidence of clinical mastitis was slightly higher in H line than A line cows and was higher in hindquarters than forequarters in both lines. Twenty seven and 33% of A and H line lactations, respectively, had at least one infection. The mean number of cases per lactation for cows having mastitis was 2.15 and 2.51 for A line and H line, respectively. Incidence of mastitis increased with lactation number up to the fifth lactation in both lines.

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