My calf is about 9 months old. On Jan 26-28 I noticed clear mucus discharge, and assumed this was a sign of her first heat. I haven't noticed it since then. We aren't breeding her until she is around 15 months old (in Oct.), but I want to keep accurate records to assure better success with IMing her. Is it usual for a young heifer to have a cycle of heat, then skip some? How old will she be when I see some regularity? She is a sole family cow, so there is absolutely no chance she is pregnant. Thanks for the info.