It's just a filler and full of carbohydrates, which aren't bad if used in moderation. I do give a small amount of whole wheat bread or Oatmeal bread to my flock a week mainly because my Muscovy's love catching things in mid air. But it's very little and only once a week. Feeding your geese uncooked rice can't have much nutritional advantage especially with out other grains to help balance it all out. Bread makes geese and people fat if they eat too much of it. And from all I read it's hard for them to digest too. I know people in other parts of the world feed their flocks differently but we still have the responsibility of making sure they have good nutrition for good health. Geese are hardy animals if taken care of properly. That doesn't mean they won't get disease but if taken care of properly can keep from it easier than other poultry. We are stewards of the earth including the animals.