For easy fert and oil, get loads of medium poop, set your ding beetle to neutral, only have poop in your inventory, disclaim the beetle then let it kill you, it should gather all the poop in your inventory with no weight restrictions. You can do this to slot cap it so no need to refill it every hour or so and no needed cages. Best way to farm and most time efficient. Can say it works as I use it all the time. Never needed to go oil farming with 7 of these. O P G O D
Get yourselves a Phiomia as well! Feed it stimberries and you'll have plenty of medium feces to throw in the dung beetle. Fill it up, and come back and watch more fertilizer than you can imagine. I'll never use compost bins again!