2 jumbos and 1 fancy

Question
I have 2 jumbo rats, male and female. and 1 fancy rat, female. i wanted to make sure the jumbo male would still mate with the fancy female. and how long does a pregnancy last from the time of inception, i believe thats the right word. please reply soon, thanks

Answer
All domesticated rats are fancy, no matter what a pet store labels them. Fancy is fancy is fancy, be they big, small, jumbo, tiny, dwarf, etc. The only time a rat isn't "fancy" is when its a wild rat. Some people like to refer to lab rats and feeder rats as non-fancy, but they still are, as they're all the same species.

So yes, they can and will all interbreed.

Pregnancy is 21 to 23 days from the day of conception. Anything over 23 is too long. If it's anything less than 21, you counted wrong.