Why don't you get a uterine biopsy done before you breed the mare? It's not expensive and it will tell you about the condition of her uterus and her chances of carrying a pregnancy. I don't consider 16 to be that old and she's only had one year off. If her biopsy score is good, I would think that your chances are good. If you don't know if the mare's been bred with frozen or how she responds to frozen, I'd make sure that you have a theriogenologist who can monitor the mare and make sure that any inflammatory response to the frozen semen is managed. I have found that I have saved money in the long run by using a breeding specialist.
Ok great! I live 20 min away from a top repo vet so I will take her in and see what he thinks. I have heard story's about mares having time off and then never getting pregnant again. I wasn't sure if 1 year could do that lol
I would say that it depends on the stallion. Some stallions' frozen is as good as fresh, but others are not so great. And some fresh is not the greatest either. But on a mare you're not sure about and trying to manage costs, I would choose a stallion with an LFG, which is most likely to be fresh, though you can find some offered frozen with LFG. That way you're not out $$$ if you're paying per frozen dose with no guarantee and she doesn't catch on the first cycle or two.