So all my 3 week old ducklings have crooked feet. The Pekings are the worst. I have been giving brewers yeast in the water (1Tbsp per 1/2 gal), and putting it in their feed. What is going on?! Is my brewers yeast fake or something? Anyone know of a good brand of niacin? Everything I find at Walmart or GNC is non-flushing. I got this stuff on Amazon.