I've had a lot of problems with feed billing. I'm not talking about getting annoying notices in the mail from the feed store that my payment is overdue. "Billing" is a kind of confusing term poultry people have given to a behavior chickens engage in - they use their beaks to scoop a lot of chicken feed out of the feeder and onto the floor. I reached a point where I would have chicken feed an inch deep on the floor around the feeder whenever I would clean the coop. I kept telling the Hipster Hens that chicken feed is NOT chicken litter. It costs a lot more than pine shavings, and it's makes me really grouchy when I have to shovel all that feed mixed with litter and poop onto the compost pile. I turned to the internet for help and found lots of advice - some of it not so good. For instance, starving your hens to alter their behavior seems both cruel and sort of dumb. Chickens are chickens and will act like chickens. Scratching at and billing their food, is just what chickens do. I did find a number of recommendations for commercial and homemade feeders that would make billing food out of the feeder difficult - which seems like a good logical approach.
The one that made the most sense was a recommendation by Jason at "Locally Laid". He waxed ecstatic about a plastic gravity feeder made by Kuhl Corp and sold by Stromberg's Poultry Supply. (It's worth mentioning that neither Jason nor I have any sort of relationship with either company.) Without any further deliberation, I ordered one and installed it in my coop. It has been a miracle. The amount of feed the chickens manage to bill onto the floor is a fraction of what it used to be with my old feeder. The secret is the extra-deep feed pan and the inward curve at the edge of the pan. The chickens still noodle around in the feed with their beaks, but the feed stays in the feeder. I'm saving so much at the feed store that maybe I should go out and buy the large screen TV for the coop that all the Hipster Hens have been asking for!