Thanks for the detailed breakdown. Three rats I could deal with. Six is in the questionable range. The biggest reason I am even thinking about doing it is the availability issue with getting the smaller rats. I am talking to some local people trying to get something lined up but no luck so far. I can get live mice at the right size, but I like to get them on rats before going out the door (should I be that concerned about this?). I have so far always been able to switch babies over but should I even bother?