Join Date: Dec 2009
Location: East Midlands, UK
I suppose it differs per individual horse, and where you live. I am deffinitely no horse breeding expert, but I know my mare doesn't go into heat in the winter. You will probably get conflicting answers as each horse is different, just like people. I'm sure if the termination was done by a certified vet, and she's gone this long without any infection, she should be ok. But of course, if you're really worried, and she shows no sign of going in in spring, then get in touch with your vet, to see what could be wrong.
But I wouldn't worry for now, as it is probably the time of year affecting her.