I have 3 nearly 3 week old White Campbell Ducklings. They are all eating well and growing rapidly, have clear eyes and are making lovely pets. For a few days my drake has been sort of scooting around on his hocks if you will, rather than standing up and walking properly. At first I was worried it was a niacin deficiency (or perhaps a weight bearing issue, he's huge and I wondered if his legs were struggling to support his weight) I've been sprinkling Brewers yeast over their feed since day dot, so to try to make sure they're getting enough I've been disolving a little in their drinking water too - the yeast is so small I wondered if it was all falling to the bottom of their feed and they were missing it. But he's still been having issues, and I think one of the girls is starting to go the same way. I've been researching endlessly, and came across a page that pointed in the direction of their food. I bought my ducks and their feed from a farm that exclusively breeds all kinds of poultry, so trusted the person running it would know their stuff inside out. I've just double checked their food and to my horror, realised it is medicated. It says ACS on the side of the bag in small letters. I feel completely stupid, and heartbroken for my babies, that I didn't double check it myself - I trusted the person selling it to me would know they shouldn't have this. Obviously I am no longer feeding them this. Can anyone advise me what damage this has potentially caused, and if it is reversible? I'm panicking that they may now have issues with their legs permanently, and god knows what else?? Any advice would be greatly appreciated, thanks in advance.