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Not sure that it's a failure but that you have LOTS of mice/rats. Keep putting them out until they start leaving them. Then you'll know you've got 'em all.
If you can safely use poison, I'd try that. DO NOT use pelleted poison though. My only EE was poisoned by those when I was a kid. The rats stored it, the EE found their stash, and ate it. You can use traps, marlin fly bait mixed in those plaster balls, the blocks of poison (One bite is commonly named on this forum as a good one.), or a 5 gallon bucket trap. I'd make sure the trap was in an area the chickens couldn't get to it, like the grain room, or keep the chickens up for a few days if they free range. A chicken could jump into the bucket and drown.
Best of luck with your rat problem. Try removing all feed, and hopefully they'll leave anyway with nothing to eat.