Food quality for cows always 100% or 15% , and why?

The quality of the food for the cows always seems to be 100% or 15%, and never anything else. I have no idea what determinse the quality of the cows food and no idea what makes the quality drop from 100% to 15% or vice versa?

I have seen Fodder Quality at 80 - 90%, but only when the Barn is being stocked initially or very rarely later: if the nearest Root Cellar/Granary is empty of Grain or Root Vegetables and the Barn Workers (‘Herders’) have to go a long way to restock, I have seen it fall to lower (60 - 80%) levels, but only very temporarily, until the Herders got back with supplies.

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