Suitable dosage of dried white distiller's grains in meat duck feed

Could an expert please advise on the maximum dosage of dried white distiller's grains (such as those from the Wuliangye distillery) in meat duck feed, on the premise that the growth performance of the meat ducks should be relatively good.

luogo added the following content on 2009-12-4 19:30

A certain amount of dried white distiller's grains should be usable in meat duck feed without an obvious negative effect on growth
--------------------------------------
Just do some animal trials, that would be more accurate