I have a HUGE jar of brewer's yeast, and I was thinking I could give the chickens a few teaspoons a week. I figure it is chock full of nutrients and good for them. I've seen postings on here about people feeding it to their ducks, but nothing about it being good for chickens. Would a few teaspoons be enough? Or, too much? http://www.vitamins-nutrition.org/vitamins-guide/brewers-yeast.html (This stuff) Thank you!