If you're going to that length, it's easier to make a maggot farm...they're actually a purer source of protein than rats, are more hygenic and have medical value in debriding wounds. You also expend a lot less energy in procuring them than you would in catching a rat.
LOL, I forgout about Liddy’s long rants about eating rats as a kid.
However, I can stomach a rat much easier, since I’ve already eaten squirrel, snake, etc. Maggots make me gag on sight.