I have a 15mth old American Alpine doe that I have not been able to detect a heat on. She is sharing a fence line with several very willing bucks, and her pen mates (all nigerians) have already all been in heat this season. Her tail has never appeared messy, and she has never seemed overly interested in the bucks. Are we just early in the season, or could she be having a silent heat? My biggest concern is that she isn't cycling at all. Any experience or help would be much appreciated.