Association of cow and quarter-level factors at ...

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Title Association of cow and quarter-level factors at drying-off with new intramammary infections during the dry period
Author(s) R. T. Dingwell, K. E. Leslie, Y. H. Schukken, J. M. Sargeant, L. L. Timms, T. F. Duffield, Gregory P. Keefe, D. F. Kelton, K. D. Lissemore, J. Conklin
Journal Preventive Veterinary Medicine
Date 2004
Volume 63
Issue 1-2
Start page 75
End page 89
Abstract Our objective was to describe cow and quarter-level factors associated with drying-off, and to evaluate their impacts on new intramammary infections (IMI) during the dry period. Data from 300 cows in five research herds were collected starting 2 weeks prior to scheduled drying-off. Variables of interest included daily milk production, teat-end integrity, formation of the teat-canal keratin plug, and quarter-milk bacteriological culture results. Overall, 11% of quarters developed new IMI in the dry period; this varied by herd, parity and time of the study. Most new IMI were caused by environmental streptococci and coliform organisms (34 and 30%, respectively). Quarters that had a cracked teat-end had higher odds of developing new infections than those without cracks (15 and 10%, respectively). Quarters that formed a keratin plug early in the dry period had a lower odds than those that did not close (10 and 14%, respectively). After 6 dry weeks, 23% of quarters were still open. The hazard of quarters closing if milk production on the day prior to drying-off was >21 kg 1.8-times less.
DOI 10.1016/j.prevetmed.2004.01.012

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