Withdrawal periods after treating cows: how to keep milk out of the tank until it's safe

What milk and meat withdrawal periods are, where their length comes from, and how to keep treatment records so no cow under withdrawal ends up in the bulk tank.

One cow milked into the tank too soon after antibiotics can cost more than a month of work: a tank to dump, a penalty from the dairy, and a lot of stress. That's why withdrawal periods are one of the things in the barn you can't keep in your head alone.

What a withdrawal period is

The withdrawal period is the time after the last dose of a medicine during which milk, meat or other products from the animal must not go into the food chain. During that time drug residues drop below the permitted level. For a single medicine, the milk and meat withdrawal periods are usually different, so you need to track both dates.

Where the length comes from

• The leaflet and the summary of product characteristics (SPC): the manufacturer lists the withdrawal period for each species and each tissue.
• Your vet: when a medicine is used outside its label (the so-called cascade), the vet sets the withdrawal period under the rules, and it is usually longer than the standard one.
• Counted from the last dose, not the first. On a three-day course, you count from the third injection.

What to record for every treatment

EU rules on veterinary medicines (Regulation 2019/6) require keepers of food-producing animals to keep treatment records and hold on to them for at least 5 years. In practice, for every treatment it pays to have:

• the date and the animal's ear tag number,
• the medicine, the dose and the batch number,
• who treated it (the vet) and why,
• the milk and meat withdrawal periods, and the date each one ends.

The usual traps

• A slip of paper with the withdrawal date taped to a post in the barn, gone or smudged a week later.
• Whoever is milking doesn't know the cow is under treatment, because only the farmer knew.
• Treatments written up in the evening from memory, with the wrong date or animal.
• Counting the withdrawal period from the first dose instead of the last.

How FarmOps handles it

In FarmOps you log the treatment once, right in the barn, even with no signal. The app calculates when the withdrawal period ends and shows it on the animal's card, so everyone on the farm sees straight away which cow can't go into the tank yet. Find the animal by ear tag number or scan the tag with the camera, and its full treatment history stays on its card for years.

Your whole farm in one app

Barn, fields, garage and finances on one phone. Get FarmOps and leave the notebook in the drawer.