Appreciate the response. This very subject was raised in another post of mine where I tried to make the switch but it involved both a regurgitation of the 1st rat pup and several refusals once I was able to build him back from the incident. In an effort to get him feeding again and put on some weight, I decided to go back on mice (possibly forever or until he's added some weight). He's currently around 260ish. The breeder (and many others on here) have said, while not ideal, males can get away w/ being life long mouse eaters. I'll try once gain when he's put on some weight but if it doesn't work, I may stick to mice and just feed jumbo mice. Thanks again for your insight.