My silver fox doe I got about 2 weeks ago gave birth yesterday(she wasn't suppose to have ever been bred before) it took me by huge surprise. She did very good making a way with hay and pulled tons of hair but I just went outside to check on them and all of them were cold and dead in the nest. She had 8 and I could tell she pulled more hair and put it on the nest to keep them warm. I have heard a lot of first time mom rabbits lose their first littter, is this true? And when should I re breed her? Also should I leave the dead babies in the nest for about a die she can realize they are dead?