Hydroponic Growing of Animal Feed?

I’m wondering if anyone has any experience in this?

I see this as an interesting concept, that paired with solar or other renewables, could be very helpful for people in certain climates.

I see barley is commonly used, and am investigating other grains.

Super cool idea, which imo besides obviously the solar panels/renewable energy, the Barley seeds or similar are inputs that need to be purchased. I guess one could grow Barley but I’m not sure if that works out economically.

Mostly, I want to know if people have done this and any experiences or knowledge they may have.