Somebody PM'ed me recently with a question about a lame gosling so I thought this would be a good reminder for all of us. I was reading in Dave Holderread's duck book regarding what he recommends for the all too common niacin deficiency seen in ducklings. Niacin is a B-vitamin lacking in chick starters. Lack of it can cause leg problems in ducklings and goslings. Ducklings that have access to forage and insects rarely have any problems but then he went on to say that most of the niacin in plants is not available to ducklings so I'm not sure what the access to forage statement means. Maybe theres niacin in bugs? Some people sprinkle Brewers Yeast on the feed. You can buy Niacin at any store that sells vitamins. Symptoms: Stunted growth, lameness, bowed legs, swollen joints. Treatment: Ducklings exhibiting niacin deficiencies and be CURED by giving them 100-150 mg. niacin (crush tablet) per gallon until they are 8 - 10 weeks old. If not treated they can have permanently stunted growth and/or crippled. Prevention...when using chick starter give supplemental Niacin at the above dosage from 0 - 10 weeks. Hope this helps!