It is actually pretty difficult for an adult emu that has the ability to exercise to become overweight. Your bird is being fed a variety of foodstuffs (which is a very good thing!) and the amount of pellets that it receives is right in line. Adult emus will average around two pounds of food intake a day. I am surprised that your maintenance feed has the same protein percentage as your grower, usually it is lower. If everything else is similar, the fiber difference should be easily made up by the ability to graze plus the spinach and fruit that it receives. We switch off to a maintenance feed, primarily because it is about four dollars a 50# bag cheaper than the grower/finisher and that adds up. When we switch over, we just gradually mix the maintenance feed pellets in with the grower/finisher feed and after slowly increasing the ratio over the course of a couple of weeks , the birds have adjusted to the maintenance diet.She runs around like a nut everyday, but how do you know about weight? With my sheep you should always be able to feel a little bump of backbone, if their back is flat they're too fat, what should I be feeling for on my emu? It takes her about a month to eat her 50 pound bag of pellets and she has fresh fruit and spinach everyday she also eats her pasture grass and clover. One more question she eats purina emu grower which says she should eat it until 10 months and then go on to mazuri emu maintenance but when i read the bag tags on both foods the analysis is almost the same with the exception of more fiber in the maintenance. Is it hurting her to still be eating the grower, she doesn't like the maintenance. Thanks so much for your expertise!