Rats & mice always leave droppings trails. Emptying your feed bowls & standing them along the wall may have alerted the rodents to change... they are suspicious of change & may have changed paths. Keep things undisturbed if you want to catch rodents.
Always fresh bait nightly. Fresh soft chedder cheese cubelet alongside purchased peanut butter-filled or creamy cheese-filled crackers gives our rodents a menu choice. Grapes or raisins hasn't worked for us. Maybe different rodent species like specific food choices? & there are so many different Rat dweller species... some are roof rats, some are sewer rats, some ground tunnelers, some garbage dwellers, some woodpile dwellers, etc etc. I never knew they had rats w/ diifferent species-related preferences.
We can go a couple weeks w/ no activity... then suddenly get 1 to 3 trapped in one week. Not sure if it's due to neighborhood cat activity dwindling the rat population or why.
Edit: Rodents have super-hearing... maybe your rats don't like the low energy hum of your zapper or battery. Try the humane cage trap, leave it always in the same place (close trap's door in the mornings from curious chickens, & open trap adding fresh food after roost). Drown the rat while still in cage before opening trap door. Drowning takes the same amount of time to kill as zappers do. There's no humane way to kill ~ both zappers & drowning are the same time. Clamp traps or sticky traps seem to make our rodents avoid them
So far this has worked for our rodent species.
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My feed and water bowls get emptied and cleaned nightly and stacked like that. The big black tubs I cover they are too big to haul into the feedroom all the time.
It's just something I have done for 40 yrs with the horses and now do with the chooks. All I do is clean poop and feed bowls, and sweep floors. Call me Cinderella.
It's going to be chilly tonight - and soon we will have this evil white stuff...