You can just throw the leftover hay where the chickens can get to it. They will probably scratch through and eat some.
But since hay is just dried plants, and drying does not increase the nutrients, it will not be any better for them than having free access to the same kinds of plants as they...
A few threads that discuss feed storage ideas:
https://www.backyardchickens.com/threads/looking-for-inexpensive-ideas-to-protect-large-amounts-of-food.1508396/
https://www.backyardchickens.com/threads/old-fridge-for-feed-storage-good-or-bad-idea.1461874/
This site does not seem to have many people doing what you are discussing.
Many of the people here have small flocks.
The most common feeding advice on here is to provide a complete commerically-produced food free choice, and to consider everything else as "treats," limited to 10% of the...
Are you refering to this post?
That post includes a quote from another poster (JacinLarkwell)
So I assumed OP was responding to the quoted bit, not to everyone in the thread.
(Like how I am responding to @sandburRanch and made that clear by quoting what I am responding to.)
I think beer does have some wet grain as a byproduct.
Chickens can probably eat it, and it would be a source of energy (calories), but I do not know how much of their other needs it would provide. At a guess, it is probably quite low in protein, the protein it does have is probably not properly...
Making your own feed is typically more expensive than buying feed, if you want to actually meet the needs of the chickens. The cheapest ingredients tend to be deficient in some way, or else be things that chickens do not digest.
I would start by making sure feed is not being wasted (spilled on...