As far as I know, they did say that they removed at least part of Kara's ovary in the farm - Simon tells her that there were lesions or something on her ovary that they had to biopsy and/or remove, and Leoben then references the fact that they have at least some of her ovarian tissue when he brings her Kasey.

Now, I realize that as this is all confirmation by cylons, it could just be lies and mindfuckery and thus not considered canon, but I always assumed that because the lie was spread between two models over a long period of time, it was at least partly true.