I've got 9 cats (long story for another day on how I got that many), feed them once a day, in the morning, and only feed them what they clean up at one 'sitting'.  If you come to the barn late night they are all out hunting.  Bad thing if you like birds 'cause they eat them too.  No mice problems and I have feed in the barn along side the combine.  I spend quite a bit on them each year between the flea meds, rabies shots and food but I'll gladly pay that to not have rodents.  Or worse, dead stinking rats that ate the bait and died in the cab of my equipment!!!!!