Holderread mentions other things as supplements for Biotin-deficient feeds (which results in more severe foot crack, etc. problems than a 'mere' Pantothenic Acid-deficient feed). He mentions Meat meal, Bone meal, etc. Well heck, bone meal is a heck of alot cheaper than brewer's yeast. If holderread himself advises that as a good source of Biotin (and other things), I assume we can say it is a fine alternative to BY, even if it is not the exact same thing. And for that matter, if duck feeds are so often lacking in Niacin, and people give them Niacin pills in the water, WHY CAN'T ONE DO THE SAME AND SUPPLEMENT LACKING BIOTIN, PANTOTHENIC ACID AND RIBOFLAVIN (AND MAYBE VIT. A ALSO) WITH A VITAMIN SUPPLEMENT PILL? A heck of alot cheaper than brewers yeast, which contains only very small amounts of those things. It seems that, whereas you need a lot of Brewer's yeast, having a B-complex pill (or whatever) which is obviously WAY more rich in the vitamins we are looking for than BY, you could get by with buying and using a much smaller volume, as the vitamin pill supplement is concentrated. But I guess one would have to do a lot of guess work about dosage, etc. But maybe feed companies which try to make a 'one size fits all' product end up doing alot of that or similar stuff! I don't know, geez. But I can't believe we duck owners are CONDEMNED to leave our birds without these nutrients unless we spend a fortune on BY. There are alternatives and Holderread says so! See Holderread in his section on FOOT PROBLEMS (esp. cracking, bumble) and the lack of the nutrients which gives rise to them.