[SarahC]

Nobody has to cull.The choice is simple,breed very few litters and keep enough spare cages to house any mice that you can't find homes for or cull.The decision can only be yours.

 

[SarahC]

It is true but unless the litter is exceptionally large they will all eventually grow to their potential.If you are planning to show mice you may want them to grow on fast and also will need to breed frequently which can rapidly fill all your cages.