immaculate conception????

[JasonBrennan]

First off, don't laugh!! I know this may sound weird and unbelievable, but I swear it is true!!

I have around 30 or so breeder mice. I keep them all seperated into groups of one male and 4 females (sometimes a few more females, depends on the number of adults I have at any given time).

Now, I have one paticular black female mouse that seems to get herself pregnant with out a male. She is on her third litter without being with a male. She has been in a seperate cage, with her babies, and no other mice. She has a litter, and by the time that litter is 3 to 4 weeks old, she is dropping another litter. She has about 12 babies right now, and they are 2 weeks old (just turned two weeks today), and she looks like she is about to burst. She has done this everytime.

Is it possible for her male babies to impregnant her before they are weaned?? I have never seen another mouse that produces like this one does. She always has around 12 babies or so, and she never looses any (so far). I wanted to give her a break, but I don't seem to have any say in the matter. Is it possible for a mouse to retain sperm??

Out of all the mice I have, she is the ONLY one that does this. Anyone have any feed back for me?? I swear, she has not had a male in with her for the last 3 litters, never even left the cage she is in!! This one has me stumped!!

Jason Brennan