i am new to ducks-and am way excited to be getting two or three blue Swedish in the spring! What type if brewers yeast should I buy? I have been looking on amazon and found one for $10 and it is just plain brewers yeast, it doesn’t say anything about it being for ducks, is it okay for ducks? Could you please just post what you use and how often you go through a container? Thanks in advance for any answers!