You can feed whole soybeans to poultry, but you must first roast the soybeans. Raw soybeans contain components that interfere with protein digestion. The detrimental effect of these components may be eliminated with heat treatment, such as roasting.
Birds fed whole grains should be given insoluble grit to help grind the grains in their gizzards. It is important to remember, however, that young chicks or poults typically should not be fed whole grains.
For more information about feeding soybeans to poultry, see the article on Feeding Soybeans to Poultry.