Draminski Dog Ovulation Detector Tester for Breeders by DOD It is a perfect device for breeders who experience problems with effective mating. Owing to this simple method, the breeder can detect ovarian cycle disorders and determine the best date of mating, even if external symptoms fail to indicate that. The device uses the relationship between changes in the electrical resistance of mucus and appearance of estrous. Measurement is easy to make and completely safe for a tested animal.