Do Ducks Need Grit?
Ducks eating only a correctly milled complete ration may not need added grit, but birds consuming whole grains, fibrous forage, or treats need access to appropriately sized insoluble grit.
What Grit Does
Ducks do not have teeth. Insoluble grit remains in the muscular gizzard and helps grind whole grains, fibrous plant material, and other foods. It is different from soluble calcium products such as oyster shell.
A duck eating only a finely ground or pelleted complete ration may not need added grit for that ration, because the feed has already been processed into manageable particles.
When Ducks Need Access
Provide appropriately sized insoluble grit when ducks forage, eat whole grains, receive fibrous greens, consume insects with hard parts, or are offered other foods requiring mechanical grinding.
Free-ranging birds may find natural grit in soil, but availability varies. A clean free-choice container prevents the keeper from having to guess whether the ground supplies enough.
Choosing the Correct Size
Ducklings need chick-size grit once they begin eating foods beyond complete crumble. Adults can use poultry grit sized for their body and feed. Pieces that are extremely fine may pass through without doing much grinding, while oversized stones are inappropriate for small birds.
Do not mix a large amount directly into feed. Ducks regulate intake better when grit is offered separately and kept dry.
Grit Is Not Oyster Shell
Oyster shell dissolves and supplies calcium; grit is hard and performs grinding. Laying females may need free-choice oyster shell, but drakes and nonlaying birds should not be forced to consume a high-calcium supplement.
Keep the two materials in clearly separate containers so they can be replenished and monitored independently.
Safe Management
Use commercially prepared poultry grit rather than sharp construction debris, aquarium gravel, or stones from areas contaminated by chemicals. Keep the container out of standing water and manure.
A lack of grit is not the only reason for poor appetite, crop concerns, or abnormal droppings. Persistent digestive signs require veterinary evaluation.