The proestrus is relatively long at 5--7 days (9 days), while the estrus may last 4--13 days, with a diestrus of 60 days followed by about 90--150 days of anestrus.
The proestrus is relatively long at 5--7 days (9 days). The estrus may last 4--13 days--150 days of anestrus. This is with a diestrus of 60 days. These 60 days are followed by about 90.