Heat detection has a larger impact on the success of bovine artificial insemination (A.I.) programs than any other management factor. The dairy or beef producer must become proficient at heat detection to be successful as an A.I. breeder.
The only reliable sign of bovine estrus is the cow standing to allow other cows to mount her. The cow may stand only 4-6 seconds each time. There will be an average of 1.5 mounts per hour.