My shoer who I am very happy with has asked me to cut back on the alfalfa on my 17 year old OTTB who has "crappy feet" (I am ok with that term).
It is hard to keep weight on so I give him half alfalfa/half grass at night. He get grass hay in the morning when turned out all day with three geldings.
He gets nutrena senior and corn oil (amount depending on the weather) and farriers formula double strength.
his weight has stayed very stable through the winter.
I had never heard of alfalfa have hoof repercussion.