I also copied what Dave Holderread sent me about food when my geese and duck order was made.
5. Supply the birds with fresh feed that has been formulated specifically for young poultry. In the order of preference, we recommend starting hatchlings on one of these feeds: duck starter or broiler starter (we highly recommend Purina's Flock Raiser ration when a duck/goose starter is unavailable). By themselves, chick starter is low in niacin, and turkey and gamebird starters are excessively high in protein (forcing young waterfowl to grow too fast). However, using a mix of 1 part chick starter and 1 part turkey of gamebird starter normally makes a good ration for baby waterfowl. Use only fresh feed and NEVER give laying rations to young waterfowl. In our experience, so-called "all purpose" or "triple duty" feeds normally are unsatisfactory if used as the sole ration for waterfowl during the first 8 weeks. We highly recommend the additional information on feeding and nutrition covered in Storey's Guide to Raising Ducks, The Book of Geese and Wing Disorders in Waterfowl.
6. Green feed (lettuce, spinach, tender young grass, etc.) chopped to 1/4-inch lengths and sprinkled in the water and on the feed helps get goslings as well as ducklings to eat quickly, and off to a fast start.