About 3 weeks ago I purchased two large normal breeder females. One is 1600g and the other is 1900g and the previous owner said he had no problems feeding them large rats everys 2 weeks. I first tried frozen rats about a week after I got them and then just the other day tried feeding them live rats. Both times they showed very little interest and now I am not sure what I should do. Any advice or previous experience with this?