The role of antibiotic dry cow therapy (aDCT)

Cannula insertion

Antibiotic dry cow therapy (aDCT) has a dual purpose:

  • Curing the existing subclinical infection at dry off
  • Preventing new infections before calving

The use of dry cow therapy has been a cornerstone of the 5-point plan for mastitis management for more than 30 years and has resulted in a decrease of contagious mastitis pathogens in many well-managed herds.

Selection of antimicrobial agents

Selection of antibiotics for masitis

Successfully treating mastitis starts with an appropriate drug choice. Although not perfect, microbiological culturing and antibiotic susceptibility testing are still the most feasible options worldwide to determine which antimicrobial has the best chance for success.

Epidemiology and management of mastitis in heifers


Mastitis in heifers varies from that in cows in several ways. Mastitis is always a costly disease, but it is even more so in a heifer. 

General procedures at the lab

Colonies of bacterium causing mastitis

Once the milk sample arrives at the laboratory, a minimum of 48 hours is required to process it. The sample is plated onto general-purpose culture media and selective culture media for the main aetiological groups.

Download the Apps!

Milk Withdrawal Period Calculator

App that calculates the time of withdrawal of milk from a cow that has been treated with the product during the drying time. The calculator takes into account the exact moment the drying began until delivery. It calculates the time remaining to eliminate milked milk from birth and so respect the product legal withdrawal time (according to the product’s technical specifications sheet).


Mastitis treatment in dairy cows mainly relies on the use of antibiotics. Now, however, a new approach offers farmers significant benefits and important cost savings. Calculate how much you can save now! Try this app!