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According to Storey's Guide to Raising Ducks: "5 to 7.5lbs (2-3 kg) of livestock grade brewer's yeast per 100 lbs (37 kg) of chicken feed or 2 to 3 cups of brewers yeast per 10 lbs (3.5 kg) of feed..." We mix small batches of 1lb 4oz of feed with 1/4cup brewers yeast from the health food store...