A company called Triple Crown makes horse feed, and one of the items they put out is a lovely bag of chopped alfalfa forage. This difference between alfalfa hay/chopped forage/alfalfa cubes vs. the pellets is (At least for horses) the fiber value. I feel alfalfa hay to my off the track thoroughbreds because of its high calcium content.. it helps to soothe their ulcer-prone stomachs (think maalox hay!) The pellets are a great buy, and certainly have nutritional value, but the hay/cubes/chopped hay will give them more of that great fiber content. That said, I certainly won't hesitate to give my chickens alfalfa pellets. If I give them hay, I make sure to cut it up in 1-2" pieces (WORK). A heavy bale of alfalfa hay in my area is around $10 (contains usually 7-10 'flakes', about 70 pounds). Chopped alfalfa hay in the bags made by TC is around $18 for 50 pounds. Cubes run about $15 and need to be soaked before feeding, and pellets run around $12-13 and should be soaked as well.