Over the years, I have given cannabis leaves to my chickens. They enjoy the taste and will eat the raw product when given access. While chicken brains lack the receptors for THC, they do not get high, CBD does affect chickens and other birds, delivering pain relief and also relief from stress and anxiety.
https://hempwell.com/blogs/pets/cbd-for-birds-what-every-bird-parent-needs-to-know#:~:text=CBD has been shown to help reduce stress,drastic measures such as sedatives or harsh medications.
CBD is of proven value in managing a flock from pain management to anxiety that often leads to feather picking.
In my state, cannabis is legal to grow, so including a couple of plants in my cover crops for my flock is something I would definitely do.