I definitely wouldn't use yeast when fermenting feed. Yeast consumes sugars and produces alcohol. When I ferment I use Lacto-fermenting: Lactic Acid Bacteria consuming those carbs and producing lactic acid. Take a look at these articles on fermenting feed. The series explains the different kinds of fermenting and what's going on in a couple different kinds of fermenting processes. The articles are pretty short and basic, but will help you understand and figure out what you want to accomplish in your feed.
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