I've tried two times so far to get an 18 month old registered Dexter heifer pregnant. First AI did not take at all; second AI seemed to work but apparently after 3 months she miscarried. She went into heat New Year's Day. Any suggestions? I have heard of hormones. I'm thinking of giving it one more try this month and then wait until summer/fall to try again for a spring 2008 calf. At this point, if she does get pregnant she will calve in the fall going into winter. Not sure that is a good idea.