My chickens were awful skinny so I started giving them alfalfa cubes with their food. They have since in the last month gained weight but their poop is very runny. It is a decent color just some are really runny and others are more solid. Is there something I can add to their food? I still want to give them the alfalfa because they are still not where I wan them to be so I would prefer to give them alfalfa, but I have since started to give them a little less and not necessarily every day.