What specifications matter for probiotics, live yeast and yeast-derived feed additives?

Identify microorganisms to the required taxonomic level and distinguish live organisms from inactivated cells, cell-wall fractions or fermentation products. Define viable count or relevant compositional marker, method, end-of-shelf-life minimum, storage, process tolerance and target species. Confirm the authorised strain, function and use conditions where required. Generic terms such as probiotic or yeast should not replace precise identification, and performance claims must match the marketed formulation.