Ok I have something going on with Bogo the Pekin. I got him free with a bag of duck starter hence the name. It looks like niacin deficiency in that he lays down a lot. When he stand both his legs tremble and shiver and then he sits. I've never had niacin deficiency with the feed I'm using, Mazuri. He's also HUGE. He's 4 months but much larger than my full grown Saxonys. He's getting swim therapy in addition to the b. I hope I don't have a meat duck issue as I wanted new DNA for my group.