Selective Dry Cow Therapy
What is Selective Dry Cow Therapy (SDCT)?
All cows benefit from the prevention of new infections by using Boviseal teat sealant but not all cows need antibiotics during the dry period. If a cow does require an antibiotic dry cow therapy, then it is about selecting the most appropriate product for the cow’s requirements - this may be broad or narrow spectrum.
Implementing a SDCT programme that consists of all cows being treated with Boviseal can reduce antibiotic usage in 2 ways:
• Reduced clinical mastitis treatment:
By imitating the cow’s natural keratin plug, Boviseal prevents mastitis-causing bacteria from entering the teat during the entire dry period, consistently reducing clinical mastitis by around 35% in the subsequent lactation1,2
• Reduced antibiotic use in dry cow therapy:
SDCT reduces the use of dry cow antibiotics but requires an effective teat seal throughout the dry period. Boviseal is proven to work with or without a dry cow antibiotic. This has been demonstrated in many clinical trials with Boviseal1,2,3,4
What information is required to implement SDCT on farm?
When implementing SDCT on farm, it is essential to gather enough information to decide whether the herd is suitable and which cows within the herd could be dried off with Boviseal only.
At a minimum the following information is required:
• Bulk milk Somatic Cell Count (SCC)
• Individual Cow SCC’s (4 times minimum)
• Clinical mastitis records.
Ideally clinical mastitis samples and samples of high SCC cows should be submitted throughout the year to determine the prevalence of Gram-Positive (e.g. Staph aureus, Strep uberis) and Gram-Negative bacteria (e.g. E. coli) on farm.
Which herds or cows are suitable for Selective Dry Cow Therapy?
Not all herds or individual cows will be suitable for SDCT. With SDCT all cows are treated with an internal teat sealant, such as Boviseal, with or without a targeted antibiotic therapy. SDCT does not mean you have to stop using antibiotics altogether.
Herds suitable for SDCT have5:
• Bulk milk SCC < 200,000 cells/ ml
• Recent infection rate <5%
• Clinical mastitis <2% of cows over the last 3 months
• Excellent hygiene at dry off
Cows from suitable herds have:
• Individual cow SCC’s <100,000 cells/ ml
• No cases of clinical mastitis
• A negative California Mastitis Test (CMT)
Thresholds may vary up or down, in discussion with the veterinary practitioner, depending on the farm’s individual situation, but hygiene at dry off should never be compromised.
For cows that require treatment, which antibiotic dry cow therapy is suitable for an individual farm?
The choice of antibiotic dry cow therapy may depend on the prevalence of bacteria.
Broad spectrum products are effective against both Gram-Positive and Gram-Negative bacteria, whereas narrow spectrum antibiotics kill Gram-Positive bacteria only.
As a rule of thumb, high somatic cell count cows, or cows suffering from chronic or recurrent mastitis cases are more likely to suffer from a Gram-Positive infection.
These cows would benefit from a targeted treatment with a narrow spectrum product as these have been shown to have better activity against Gram-Positive pathogens such as Staph aureus and Strep uberis than broad spectrum antibiotics6.
When faced with the prospect of selective dry cow therapy farmers should talk to their vet who will consider their individual farm situation when deciding which cows should receive Boviseal alone and which antibiotic should be used alongside Boviseal for the remainder of the herd. The more information that is available the more accurate the decision in ensuring the right cow receives the right treatment.
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