The hens were prescribed an antibiotic, they recovered — and the eggs go back on sale. That’s a mistake: drug residues keep leaving the body for days or weeks after the last dose. The time during which produce must not be used for food is the withdrawal period, and observing it is the farmer’s responsibility.
What it is
The withdrawal period is the time from the last dose of a drug until eggs or meat can be used for food. Until it ends, the produce may contain drug residues. For buyers that means allergies and antibiotic-resistant bacteria; for farmers, fines, lost customers and damaged reputation.
Where to find it
- in the product leaflet, in the section on use of produce;
- separately for meat and for eggs — the periods are almost always different;
- for each species: a period for chickens doesn’t carry over to ducks or quail.
If the leaflet gives no period for eggs, or says the product is not for use in layers producing eggs for human consumption, it must not be given to layers — or the eggs are destroyed for the whole treatment and withdrawal period. That decision belongs to a vet.
How to count
- The period runs from the last dose, not from the start of the course.
- If the drug went into the water or feed of the whole house, the period applies to the whole flock, not only to sick birds.
- With several drugs, the longest period applies.
- If the vet prescribed a dose or route different from the label, the vet sets the withdrawal period, and it’s usually longer.
What to do with eggs meanwhile
Collect eggs as usual so hens keep their rhythm and you don’t encourage egg eating, but don’t sell or eat them. They’re disposed of. If the farm has several houses, treating one doesn’t stop sales from the others — just don’t mix the eggs.
Meat and slaughter
Birds can’t be slaughtered for meat until the meat withdrawal period is over. Keep this in mind when treating broilers or ducks shortly before slaughter: sometimes the course has to be chosen with the date in mind, and that’s a question for the vet.
Records
For every course, write down:
- the house or flock;
- the drug, dose and route;
- start date and last dose date;
- withdrawal periods for eggs and meat and the date they end.
These records help during inspections and with large buyers. Prevention that reduces the need for treatment is in small farm biosecurity and the vaccination schedule.
Withdrawal in plain sight
In EggPulse, when you log a treatment you set the withdrawal periods for meat and eggs, and the house is marked with how long is left to wait. Everyone on the farm sees the mark, so eggs from that house don’t go on sale by accident.
