The Estrotect Breeding Indicator takes the guesswork out of your cattle breeding program. Just apply the patch to the tailhead prior to standing heat. When the cow is mounted, the scratch-off surface is rubbed off, exposing the "color signal" that shows the animal is in standing heat and the breeding protocol should be started. This heat detector indicates when cows are ready to breed, helps confirm pregnancies, and provides pinpoint timing for AI protocols.