Yes, not only do they LOVE Alfalfa, it is extremely nourishing for them, especially during those winter months when there is little dark green and leafy to munch on.
I get the Dehydrated Alfalfa Cubes in the Horse section of
Tractor Supply. I think a 50 lb. bag was only about $14 and it's lasted me all winter with
giving it regularly to over 100 chickens.
I just get a big plastic pail, fill it about 1/3 full of the cubes then fill the rest up with water. By the next morning you will have a pail full of very dark
green stuff that smells and looks a lot like cut spinach.
I just go from coop to coop slinging the stuff and they literally go crazy over it and fight over it. During the spring and summer they get plenty of
organic greens from pasture and garden but in winter it fills in that nutritional gap and, maybe it's just my imagination, but I think it helps make
my yolks darker orange as well.