I was told ducks need to be supplemented with niacin because chicken food doesnt provide enough for ducks. I never have and never had any issues and my older ducks are now 8 months old. Just this week our silkies hatched our first batch of pekin ducklings. We went to the feed store and the owner suggested we supplement with niacin for a week then stop and maybe do it every 6 months if we feel we need to. We bought a vitamin and electrolyte "plus" mixture that has niacin in it. Only problem it says to use the whole 4 ounces in 128 gallons of water. Any idea how much we would use for 1 gallon?? & how much we should use it for the babies and the adults??Do chickens need any??