Yep each and every year. Some felt the change early on, and ovulated really early, abnormally early. Some are still building... things are just a bit off. Does this mean they will go early/late again next season (in the fall)? No idea, I will assume yes and put the males with them early on, and try to cool the room slightly, early on, so when the drop in temps happens (naturally) it won't be so drastic as it was this year.