Steps for Implementing SDCT
on Large & Mid-Sized Farms
Assess Herd Records
a. Records must be accurate, complete, and timely
b. Clinical mastitis events should be documented
c. Monthly individual animal SCC data is recommended
d. Culture results (if available)
Cows meeting at least one of the below criteria should receive treatment
a. Cows with more than 2 cases of clinical mastitis during previous lactation or a single case of mastitis that occurred in the past 30 days
b. Cow with DHI test day SCC >200,000
c. Animals with a positive culture at dry off should receive treatment.
Caption: From DC305 for creating criteria for dry off.
a. Identify and enroll cows systematically using your set criteria (determined in Step 4 above)
b. Accurately record cows - Can use farm data systems (DC305, PC DART, or manual records) to document SDCT cows
Train all employees using the new/revised SOP
Cleanliness/hygiene at dry off is ESSENTIAL
Cows must be enrolled SYSTEMATICALLY - in accordance with the criteria in your protocol
Be sure that milking procedures are well-managed, and employees are consistently trained
Use of teat-end sealants is encouraged
Monitor production levels before dry-off and include production level criteria--which should be set by the farmer, their herd veterinarian, and nutritionist--in the dry-off SOP (see the National Mastitis Council “Drying Off Methods” section of this fact sheet)
Consider transitioning rations prior to dry-off to facilitate reduced milk production, which should be agreed by the farmer, their veterinarian, and nutritionist.
“The word is “selective,” not “none”. We still need to treat at-risk cows in the herd.” (Johnson, 2018)
Use of Internal Teat Sealants in quarters not treated with antibiotics significantly reduces new infections in the dry period