stored indoors. Postmilking teat disinfection and dry
cow therapy were practiced in all herds.
At the beginning of the study, a cohort of 10 clinically
healthy cows was randomly selected in each herd
within parity blocks (4 heifers, 3 cows of second parity,
and 3 cows of third or higher parity). Before the end
of the study, 20 out of the 60 cohort cows were culled
(ranging from 0 to 5 per herd) for diverse reasons, including
problems with lameness, udder health, fertility,
or milk production. All cohort cows culled before the
12th month of the study (n = 14) were replaced by
randomly selected herdmates of the same parity. The
cohort cows were, on average, 11.2 mo under study.
stored indoors. Postmilking teat disinfection and dry
cow therapy were practiced in all herds.
At the beginning of the study, a cohort of 10 clinically
healthy cows was randomly selected in each herd
within parity blocks (4 heifers, 3 cows of second parity,
and 3 cows of third or higher parity). Before the end
of the study, 20 out of the 60 cohort cows were culled
(ranging from 0 to 5 per herd) for diverse reasons, including
problems with lameness, udder health, fertility,
or milk production. All cohort cows culled before the
12th month of the study (n = 14) were replaced by
randomly selected herdmates of the same parity. The
cohort cows were, on average, 11.2 mo under study.
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