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OJVRTM
Online Journal of Veterinary Research©
Volume 11
(2) : 67-79 2007
Self-Cure rates
in American Dairy Cows infected with Staphylococcus aureus at Drying Off
Reeve-Johnson
L1, Nickerson SC2
Veterinary Pharmacology,
School of Veterinary Science,
University of Queensland, QLD 4072, Australia and Edgar L. Rhodes
Center for
Animal and Dairy Science, University of Georgia, Athens 30602, USA
ABSTRACT
Reeve-Johnson
L, Nickerson SC, Self-Cure rates in Dairy Cows infected with Staphylococcus
aureus at Drying Off, Online J Vet Res, 11 (2) : 67-79, 2007. In a large multicentric
study, several factors were demonstrated to be linked to the ability of
dairy
cows to spontaneously or self cure (without dry cow therapy) over the nonlactating period from natural intramammary
infections (IMI) caused by Staphylococcus
aureus. These factors included parity
of cow,
somatic cell count (SCC), site-specific factors, length of dry period,
and the
number of quarters initially infected. A predictive model was developed
for the
likelihood of self cure based upon the SCC of cows at dry-off to aid
the
prioritization of treatment or culling decisions.
Key
words:
dry period, mastitis, self-cure, Staphylococcus aureus)