I want to make my eggs and chooks as healthy as I can so they have their crumbles, but in addition they get greens like spinach and and whatever we have veggie wise thats scrap or left over. They got broccoli stumps yesterday. They have a high concentration of boss in thier scratch, and they get weekly treats for health like yogurt and sardines. The yogurt keeps their tummies in good shape and the sardines are a high protein treat that is also high in omega 3...plus the oil they are in gives them some fat calories in the cold. I am also sprouting some lentils for more greenage. I only have 3 of them so it doesnt take much for them. Folks with oodles of chickens probably have a harder time supplementing.