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Medium white eggs in carton. Chicken eggs are graded by size, for the purpose of sales. The egg shell constitutes 8–9% of the weight of the egg (calculated from data in Table 2, F. H. Harms). [1] A scale for grading eggs. An egg scale that was patented in 1924
Eggs laid by many different species, including birds, reptiles, amphibians, and fish, have probably been eaten by people for millennia. Popular choices for egg consumption are chicken, duck, roe, and caviar, but by a wide margin the egg most often humanly consumed is the chicken egg, typically unfertilized.
Usually, only one egg is laid per season. The kiwi lays one of the largest eggs in proportion to its size of any bird in the world, [34] [a] so even though the kiwi is about the size of a domestic chicken, it is able to lay eggs that are about six times the size of a chicken's egg. [37] The eggs are smooth in texture, and are ivory or greenish ...
The chicken (Gallus gallus domesticus) is a large and round short-winged bird, domesticated from the red junglefowl of Southeast Asia around 8,000 years ago. Most chickens are raised for food, providing meat and eggs; others are kept as pets [1] or for cockfighting.
The females lay 10-12 glossy eggs in a scrape. The male incubates the eggs and raises the chicks. [4] The eggs are covered with feathers when left unattended. Incubation is around 21 days. The chicks are buff with dark stripes, and run soon after hatching and fly when half-grown. Later in life blue or gray spots may appear.
Ostrich eggs are the largest of all eggs, [68] though they are actually the smallest eggs relative to the size of the adult bird – on average they are 15 cm (5.9 in) long, 13 cm (5.1 in) wide, and weigh 1.4 kg (3.1 lb), over 20 times the weight of a chicken's egg and only 1 to 4% the size of the female. [69]
Chicken and duck eggs on sale in Hong Kong. Poultry is the second most widely eaten type of meat in the world, accounting for about 30% of total meat production worldwide compared to pork at 38%. Sixteen billion birds are raised annually for consumption, more than half of these in industrialised, factory-like production units. [58]
Galliformes / ˌ ɡ æ l ɪ ˈ f ɔːr m iː z / is an order of heavy-bodied ground-feeding birds that includes turkeys, chickens, quail, and other landfowl.Gallinaceous birds, as they are called, are important in their ecosystems as seed dispersers and predators, and are often reared by humans for their meat and eggs, or hunted as game birds.