Takes the guesswork out of detecting heat in beef and dairy cattle. These low-cost detectors make artificial insemination easier, more practical, and more profitable. Invaluable in pregnancy determination and detection of estrus. Apply the small (4-1/2" L x 2" W) plastic detector with adhesive, over the sacrum of the cow (located on the line between the hipbones and the tail head). The detector remains white until it is triggered. Triggering takes place when the pressure from the brisket of a mounting cow turns the detector a bright, easy-to-spot red indicating the cow is ready to be bred. Each box of 25 patches includes one tube of adhesive. 95% accurate.