One of my friends from another forum just posted this on mouse mash, thought it was a good read 

Oh and by the way, he IS really opinionated and blunt, but he would help anybody in need.Personally, I don't use Mouse Mash anymore because, not to blow my own trumpet but I breed good quality mice with good quality fur because I have spent alot of time working on their mix diet and breeding (mainly breeding, haha =P J/K) so I have no reason for Mouse Mash but I used to use this recipe. I called it the "AshSmashMash Mouse Mash" - If you can say that outloud at normal speed then Kudos to you, aswell. Lol!
But back to the recipe, for a skin/coat conditioner mash I put in:
1 cup rolled oats - Ground - Bulk and binder of the mix.
1 tsp organic kelp powder
1 tsp powdered copper
1 tsp lactol powder
2 slices stale whole wheat bread - Crushed to powder form
If I am only feeding a few then I mix this altogether then stored it in a cereal container (the one with the flip up lid at the top - 23p from asda!) and pour out 3/4 of what I want the mix to make up then I put water until its tomato soup consistency and feed. However, as I have 100+ mice I usually put it into buckets, mix it up then go around with the bucket and use a measuring jug to put it into the tubs in bowls. If one of the mice is having alot of trouble with skin or coat condition I will ad a tsp of pure sunflower oil to the mix once it is made up.
Chealsea 1996 - Personally, I think that it is silly not to share your recipe. What will you gain from it? The mouse community is supposed to be a friendly place where breeders help breeders in producing and making the best "stock" they can. How about you stop playing childish games and share with other breeders you recipe. IMO a conditioner mash shouldn't be relyed on for skin and coat health - Thats up to the breeding.