I was wondering this myself. Barry is a course in English Lop so he is a large breed, I've been feeding him Oxbow young rabbit formula and it says on the bag that you do not need to feed alfalfa hay with this pellet, so he's been getting timothy hay from the beginning. I thought because he was a larger breed that I needed to feed them longer because he is still growing. He will be 5 months old October 1st and his ears are still only 10 inches long. Both of his parents ears were 21 inches long. Pretty sure he's still got a lot of growing to do.