How to use Wuliangye Distiller's grains

Now corn, mixed meal and other raw materials are very expensive, want to use distiller's grains on meat duck feed, liquor distiller's grains color is very black, liquor flavor is strong, crude protein 23%, liquor taste has no effect on duck feed, how much is appropriate, experts who have used, please express their opinions. -do people usually use distiller's grains from beer or spirits? Confused-some brewers are produced by breweries, and some are produced by breweries such as Maotai Distillery and Wuliangye Distillery, but they are commonly used and distillers' grains are rarely used. -I've never heard of using distiller's grains.