So, my mouse project is a huge success. My last two litters, all the ones I wanted ended up being female. And today, I just got two more litters, and two more on the way. My mice are wierd, all are very adoptive and are great mothers. The last time I attempted to breed mice I had different results. As for the bedding, I use a combination of Equine Fresh and shredded paper. I found that quite a few babies ended up getting buried and died in the equine fresh alone, so for mothers, I give them a top layer of shredded paper to cushin the babies.