with this number of ferrets you want to be sure each is getting what it needs,
personally at the moment i have four 10 -12 week old kits in one run and a jill with a three week old litter in another,,
what i do is i take the jill out of her hutch, handle her and check her over etc, then pop her in ferret box with her meat (minced chicken/lamb, tinned fish, diced wood pigeon etc) clean out her run and sort water check on litter then pop in egg and milk mix if its the right day and pop mummy fezzer back in her hutch in peace,, this means i can supervize her intake and ensure she doesn't hide