Hi, me again,
I have learned that if you get a female to allieviate your male's frustration then you can expect two litters a year. Each litter is between 2 and 7 babies although the norm is 4 or 5. Litters are born in April and July. The babies are weaned and independant at two months and will then need new homes! Hope this helps, please let me know what your vet says about nuetering.