thanks for the considered response.If only every one on forums could be so civil.Whilst feeding in the shed I have also given it more thought.My thoughts revolved around other fancies.Rabbits,some very unsociable varieties.Polish dwarf spring to mind,cat varieties,many with catitude that don't make great pets.Some poultry have serious attitude although I think its the cocks rather than hens.Nobody in these fancies thinks anything of it.There is a stud buck class for mice.I had a good conversation about that with a long time fancier at Bingley.His opinion was winning the class used to have importance and generate respect.Over the years he thinks the importance of the stud buck class has dwindled in peoples eyes and is hardly worth having.I'm very interested as well in all these things and always try to get answers from people who have seen a few decades of showing.With male mice being in general more feisty than rats I guess people don't want the hassle of housing big numbers .As for castration,I'm afraid that although mice are my passion, I don't think they can compete as a rewarding pet, with the rat.Rats come out of the nest interested in humans and just about tame themselves and always welcome interaction.For that reason they attract owners that are willing to spend on them.I don't think it will ever be the case for mice.There are of course exceptions.