Thanks, David, but even the place in Tampa quit carrying the specialized block and started in with the generic stuf when I was last there in 2004 -- I don't know what the real research labs are doing to ensure that the lab animals get the right diet -- There's a surprising difference even between rats and mice, which I would think are virtually the same in that regard.

Not trying to keep them all on a controlled diet for research purposes, I figure I am giving them what they need with all the extra food.