Well it's just odd that they won't eat something they used to love they would jump up in the air for them but now they look at it like we'res the food u brought me but the are so spoiled it's probably why they won't eat them
My farm Mom said chickens/ducks/geese will eat whatever their bodies need.
I laughed when one guy asked why his chickens were eating a styrofoam block in his backyard and someone told him not to worry because the chickens were having fun and the styrofoam would come out the same way it went in!
Birds are silly but I do believe they seek out food/nutrition that their bodies need at different times of the year. In heat waves, molting, etc, they seem to have less appetite and during cold weather and laying cycles they eat everything they find.