Niàngjiǔ shèngxià de jiǔzāo cháng yòng zuò sìliào.
The leftover distiller's grains from brewing are often used as animal feed.
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culture
酒糟 is the mash left after distilling baijiu — rich in residual aromas, it's reused as a cooking ingredient (酒糟鱼, 糟溜鱼片), as livestock feed, and in some skincare products. 糟 alone can mean ‘dregs’ or ‘spoiled’.