We keep ours in a 1.2 trios. We have found that if you let them grow up a little we usually get about 20 per litter feeding kent 23% rodent diet. We do add a little alfafa to help the mothers nurse. but I do know that if you have smaller asf they do not produce as well. Some friends of ours soft furs are not as large as ours and don't produce the numbers we do.