I have two of 12 cows that was synced and it's been four days with no heat. This happened last year too. I bred that one 72 hrs anter estamate and cidrs pulled, like protocol called for. Bit she ended up coming in heat three dats later after we turned her back out. So this year I'm waiting out to see if they come in heat. I don't want to wast semen if no heat sign. Has anyone else had this situation happen and wat would y'all do. Is there a way to prevent this delay heat from happening or not. Thanks.