Rat breeding - no idea what to do, please help

[prairiepanda]

If you post pictures of all their "butts" I can sex them in a snap and edit your photos to point out what exactly what I'm looking at, if you'd like. The surest way to determine sex in gerbils of any age is by looking at the distance between the anus and urethra(two holes on their butts); on females, they are right next to each other, but in males there is a space in between. They're perfectly fine eating mouse food. When you run out of that, I found that rat food tends to be better formulated for gerbils than hamster/gerbil food is, as it provides more protein and fat. Breeding females benefit from a bit of extra protein too. I gave them a kibble of cat food each day to satisfy this, but peanuts or insects would work too.