Like most fowl, geese are omnivores. They eat both plant and animal matter, albeit in varying proportions. Geese eat Grains, Greens, Fruits, Insects, and Seeds.
Geese will nibble at whole apples and can eat them. But the issue with giving geese whole apples is that they can choke from eating it.
Whole Apples
Geese can eat apple peels without issues, especially if they are thinly cut. Apple peels are actually beneficial to a goose’s digestive system. About 66% of an apple’s fiber content is found in the peel.
Apple Peels
You should not give apple seeds or pieces of apple containing seeds to your geese. Apple seeds contain cyanide, a substance that is very poisonous when ingested by geese.
Apple Seeds