Maybe they're too cold, I hear people that keep them outside in garages and unheated sheds get poor head counts during the winter months.
If your females are more than 6 months old, they may need to be retired.
My freezer is so full right now that I don't have any room for human food, only rats, whisky, and ice.
It's ok, the frozen ones don't eat much, but sometimes the ice tastes funny. I just add more whisky to my drink and all is well...

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