Domestic goose

A domestic goose is a bird that humans have domesticated for various purposes. People keep these birds for their meat, eggs, or soft down feathers. They are also kept as companion animals. These birds are not a single original type. Instead, they come from two different wild ancestors through a process called selective breeding. One ancestor is the wild greylag goose. The other is the wild swan goose.

Selective breeding changes how these birds look and behave. In Europe, northern Africa, and western Asia, domestic geese come from the greylag goose. In eastern Asia, they come from the swan goose. These Asian types are often called Chinese geese. You can tell them apart by looking at their bills. Domestic swan geese have a large knob at the base of their bill. However, many modern flocks are hybrids. These are mixed birds that show traits from both parent species.

Humans have been raising geese for thousands of years. The oldest evidence comes from the Hemudu culture in China. This was near the Lower Yangtze River about 7,000 years ago. There is also evidence of geese in Egypt from more than 4,000 years ago. Ancient Mesopotamians also kept geese for food and sacrifices. By the time of the Roman Empire in the 1st century BCE, goose husbandry was well established. During the Medieval Period, many peasants kept very large flocks of geese.

Domestic geese have changed significantly in size compared to wild birds. Some domestic breeds can weigh up to 15 kilograms. This is much heavier than a wild swan goose or a wild greylag goose. This weight changes how they stand. Wild geese have a slim rear end and a horizontal posture. Domestic geese store large fat deposits near their tails. This gives them a fat rear and forces them into an upright posture.

These birds are also much more productive than their wild ancestors. Scientists look at fecundity, which is the ability to produce many offspring. A female domestic goose can lay up to 100 eggs in a single year. In contrast, a wild goose only lays between 5 and 12 eggs. Domestic eggs are large and weigh about 140 grams. They have a higher proportion of yolk than chicken eggs. This makes the eggs cook to a denser consistency.

Geese also show different colors in their plumage, or feathers. Many have been bred to be completely white. White geese are often preferred because they look better when plucked for food. Other breeds, like the Toulouse goose, look very similar to the original greylag goose. Most domestic geese also show little sexual dimorphism. This means males and females look very similar. You can tell them apart by their behavior. The males, called ganders, are usually taller with thicker necks.

Geese are famous for being very protective of their families. A gander will stand between his mate and any perceived threat. Because they are aggressive and make loud calls, they are excellent guards. In the late 1950s, the VNAF used geese to guard aircraft in South Vietnam. During the COVID-19 pandemic, about 500 geese helped patrol a 533-km border between China and Vietnam. Officials noted that these birds can sometimes be more aggressive than dogs.

Finally, geese are important to many culinary traditions around the world. People use the meat, liver, skin, and fat in many different cuisines. The eggs are used in cooking similarly to chicken eggs, though they taste a bit more gamier. Because some domestic geese are the same species as their wild ancestors, they can interbreed. If a domestic greylag goose escapes, it can breed with wild populations. This results in offspring with mixed white and grey plumage and orange beaks.