I started like you, I would buy a months worth of mice, when I was down to the last 2, I noticed that 1 didn't have nads and looked a little fat, I was surprised cause they usually don't sell females. well a week or so later Feb 3rd she had a litter of 8, her second litter is almost weaned, and I picked up 3 other females, I only have 2 babies on mice, and have another member here who needs pinkies, so I freeze 2-3 from each litter for them. I keep them all in a 40L

I also picked up 2 breeding groups of asf's 2 weeks ago that were preggo , 2litters on the ground with a third due any day now.