Ok, so I can never say no to free. Picked up 6 14-week old muscovys. As far as I can tell, it's 4 girls and 2 boys. My question is this. The previous owner was feeding chick starter and cracked corn. My chickens are already on layer mash. Can I feed the ducks the same, or do I need to keep seperate feed, and if so, for how long?