Estrus, Detection, estrus detection, heat detection, artificial insemination is the surest, quickest, easiest way to genetic improvement. And as everyone also knows, in order to have a successful A.I. program, you need to get properly handled and prepared semen placed in the reproductive tract at the proper place and at the proper time. While correct handling and proper placement of semen is easy to learn, proper timing of insemination requires accurate heat detection and knowing the precise onset of heat.