ALERT:
Ok I am not a chicken expert, but am somewhat of a coffee guy. Ive been selling coffee online for close to 10 years, and brewing, all sorts of stuff for close to 20 years.
With that being said.
When you brew coffee, you do NOT take all of the caffeine out of it ! There is still some in the grounds yet.
Now, starbucks and the likes, are NOT going to rebrew coffee! They brew it once, it gets thrown into their rainbows and unicorn fart bin and sold to the next schmuck who is going to pay 10 for a pail of coffee grounds. Maybe yours gives the grounds to you, either way, they STILL have Caffeine in them !
(Ok now I can see the smart ass chiming in, 'but what if they used decaf grounds?')
Go ahead play games see what happens. It's YOUR dead flock.
At best, they probably dry these grounds out and then 'transfer custody' over to whomever..who then bags them and sells them to YOU.
THEY STILL HAVE CAFFEINE IN THEM !!
Another thing to consider is, coffee has Theobromines in it, which is toxic to birds.
(Disclaimer: There is still a lot of debate on how much is in roasted coffee, and of course this will vary widely with the coffee and roast method) but for the sake of this topic, there is a potential it is there. Even if not, there is STILL CAFFEINE in the coffee.
Caffeine is NOT good for birds. Chicks are possibly more susceptible to it's affects.
Lets try some simple math.
A pot of coffee takes roughly 60g of coffee grounds to make.
A pot of coffee will totally wire a 200 pound fat ass such as myself.
This means 6 grams will wire a 20 pound fatass
This means 3 grams will wire a 10 pound fatass (HUGE CHICKEN)
Lets just assume that half the caffeine been leeched out of this coffee because it was used once already.
This means 3 grams will wire a 5 pound fat ass (Most normal chickens) give or take a lb or two. Your baby chick weighs what? A full pound now?
here is what 3 g of coffee looks like:
As you can see, it does NOT take a heck of a lot of coffee grounds to equal up to 3 g.
NOW: How much of this do you think your girl may ingest, when poking around for bugs? When scratching around for gizzard grits? May be stuck to food or mixed with food that happens to make it's way there? Eats straight up because coffee smells / potentially taste good to her?
How much DIRT do you think they eat every day just picking up bugs and goobers out of the ground? With that--- how easy do you think it would be for them to eat this much coffee grounds, whether purposely or accidentally? ---- A tablespoon full??
Again, I am not a chicken expert, I just present this as food for thought.
Thank you
Aaron