Is buckwheat a good "GREEN" for chickens?

[cabincrazyone]

I've read a bit about buckwheat ... I'm wondering if it would be worth my while to plant some and harvest the entire plant for winter "greens" for chickens. Your opinion?

 

[HorizonSon]

I just purchased five pounds of buckwheat seed (and five of rye) for growing this year for us and the chickens.