A Pekin duck is a breed of domesticated duck used primarily for egg and meat production. Bred from the Mallard in China, nine ducks were imported to the United States in 1873. It is the most popular commercial duck breed in the United States. These ducks are ready for butchering at 6 to 8 weeks of age and produce more meat that is desirable for eating than other breeds of duck. Its meat is very tender and mild and well-suited for many menu options. The eggs are slightly larger than a large chicken egg, and tend to have a more durable shell and stronger membrane which makes them harder to crack open than a chicken egg. Duck eggs have more protein, calcium and many vitamins, as well as more fat and cholesterol, per gram than a chicken egg. Duck eggs are very similar in flavor and texture to a chicken egg. They can usually be substituted for large or jumbo eggs in recipes. The mascot of the insurance company Aflac is a Pekin duck.