Six weeks before you start inseminating, mark the whole herd with the 1st colour (red).
Worn-off dye indicates that the animal is in heat. Animals in heat are marked until the start of insemination with the second colour (blue).
Inseminations can begin after six weeks. Animals still marked in red that do not have a cycle should be examined by a vet and treated if necessary.
All inseminated animals are marked with the third colour (green).
Animals that are inseminated repeatedly are marked with the 4th colour (orange).