Yes. You can free choice all flock to the Ducks you were gifted. It's not a bad idea on General principles, when you don't know how they were fed previously, to give them a moderately high protein complete feed to help with the stress of adjusting to a new place. The most important thing about ducks to remember however is that they need a relatively deep bowl of water to clean their bills out. Which by the way they are likely to tip over. So make certain that wherever you feed and what are them is very easy to clean up and can get wet. My flock is in my signature below I currently have about a dozen ducks. Hope that helps.I have a mama duck nesting 3 eggs in my front yard. A neighbor gave me a bag of Flock Raiser but there are no instructions. Do I just put out a bowl of it? Thx!