Data from 300 cows and 1,178 quarters
were analyzed to determine factors associated
with new intramammary infections (IMI). Teatends
that were cracked and teats that did not
close during the dry period were 1.7 and 1.8
times more likely to develop new IMI, respectively.
The level of milk production on the last
day of lactation significantly influenced new
IMI and teat canal closure. More (P<0.05) cows
(36%) producing $21 kg of milk developed new
IMI than cows (18%) producing less. When
milk production was 21 kg or higher, teat canals
were 1.8 times more likely to remain open.