The amount of dry white distiller's grains in meat duck feed

Ask the expert to advise the maximum amount of dry distiller's grains (such as Wuliangye Distillery) in meat duck feed, as long as the growth effect of meat duck is better. Luogo added the following at 19:30 on 2009-12-4. Meat ducks should be able to use a certain amount of dry distiller's grains without obvious negative effect on growth-- do some animal experiments, be more accurate.