When we buy whole pork loins to cut up for boneless chops I save all the fat trimmings and cube those up into 2" pieces. I do same with carcass chickens save the trimmings and skins when I cut them up. I dont add anything just freeze them in ziplock bags for dirtholes. Same with guts and scraps, parts from pheasants, deer, rabbits, anything else we hunt and clean. All good natural baits.
I have a pretty extensive mouse line going on our property in fall. Catches go in ziplock bags and into the fur freezer. Nothing beats a fresh frozen mouse down a dirthole and a shot of fox pee for natural bait coyote sets. In hay meadows I make a double dirthole set two small holes opposite each other and trap bedded between them. A mouse down each hole and then use handle of my trowel to make a little mouse runway across the dirt pattern right to each hole. Looks just like the natural mouse runways you find out there anyway.
The game and meat scraps I use in late winter sets in bean fields. Kick up the bean chaff into a big pile, one one side push some scraps back up under edge of the pile and bed the trap our front. A shot of fox pee on the same side and that's my go to winter bait set. Ground too rock frozen solid to dig holes. Most picked bean fields have similar piles here and there from the combines. Mice live in the piles for shelter and I find stashes of beans in them where mice were storing food. Make my own piles in the field at a good spot along edges and travel ways and it works well for a set, looks like everything else around in the field. Fresh bait and pee seemed to work best for me.