Bedding, soil or water that is contaminated by manure.
How Is Infection Spread?
From the environment to the cow at any time. The risk of new
infection is highest in the first two weeks of the dry period
and around calving time.
About 50% of cases will be clinical during the course of infection.
About 60% last less than 30 days.
Clinical signs (changes in milk, udder or sick cow). Culture
of milk samples collected at the beginning of clinical signs.
Reduced production, loss of milk discarded for treatment and
withdrawal time. Some infected cows become sick (fever, off
Sensitive to penicillin, but cost-recovery on routine usage
is controversial and variable. Resistance to antibiotics (Strep.
uberis) has been reported, but is very rare.
Estimated Cure Rates:
Antibiotic treatment during lactation - 70-100%
Antibiotic treatment at dry-off time - 70-100%
- Milk only clean, dry teats.
- Keep bedding clean and dry in lactating and dry cow environments.
- Calve cows in a clean, dry box stall or on pasture.
- Keep yards, pastures, and laneways dry.
- Maintain equipment to reduce liner slips and keep teat ends
- Balance lactating and dry cow rations to meet NRC recommendations.