I had a cystic doe once and her heat cycles were 3-5 days instead of 2-3. She had a long period where she didn't cycle and I thought she was bred, but then she started coming back into heat sometime in January and it's like she wouldn't stop! She had very long heat cycles, then she would subside a bit and then come roaring back into a another strong and vicious heat cycle 5-10 days later. She didn't get bred that year. By the time I found out what was going on and knew what hormones she needed, it was too late in the spring and I decided to wait. She cleared up on her own and bred on the first try the following November. She sure acted strangely during that winter and spring though!