I would expect the coffee grounds to fall to the bottom and the shavings to sit on top, just based on what happens with small and large pieces in any other kind of bedding.
I can't say whether that would be a good thing or a bad thing, just that it will probably happen.
^ That was posted in July, 2020.
It appears that research is continuing. I found another study, dated September 2020, that involved adding straight caffeine to the diet of laying hens.
The title is, "Effects of Caffeine on Egg Quality and Performance of Laying Hens."...
Hmm. I think in that situation I'd look at paper-type things. Cardboard boxes, newspaper, junk mail, envelopes, maybe used kleenexes, used paper napkins, paper bags... Some of them would need to be ripped or cut before putting them in, of course. (My household produces plenty of paper-type...
Oh, that is a problem. Do you have newpapers or junk mail? Paper is "brown" for composting purposes. You could rip it up and add it. It also tends to be dry, which is helpful if the pile is too wet.
Depending on how bad it smells--it might be worth getting a bale of straw or wood shavings or...
I don't actually worry about what color/kind of things go in my compost, as long as it doesn't stink. (If it does stink, it needs either more dry matter, a few days of sun, or something to keep the rain off :) ) So I dump coffee grounds in compost without caring about the ratio or balance. (Or I...
IF they eat it, maybe. But chickens are fairly good at taking a bite or two and deciding it's not really good to eat.
Plenty of people use shavings or sawdust or sand, and it's not good for chickens to eat large amounts of those either.