I have 3 week old Pekin ducklings. This is our first time raising ducks. I have found this site to be a great resource and was reading about angel wing. I read to add rolled oats to cut back on protein. Do I need to grind the oats and how much do I add? Do I need to then add more niacin? Do I need to offer grit then as well? Any advice would be appreciated! Thank you!