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The yolk of a chicken egg Diagram of a fish egg; the yolk is the area which is marked 'C'. Among animals which produce eggs, the yolk (/ ˈ j oʊ k /; also known as the vitellus) is the nutrient-bearing portion of the egg whose primary function is to supply food for the development of the embryo.
Poultry meat and eggs provide nutritionally beneficial food containing protein of high quality. This is accompanied by low levels of fat which have a favourable mix of fatty acids. [70] Chicken meat contains about two to three times as much polyunsaturated fat as most types of red meat when measured by weight. [71]
A dual-purpose chicken is a type of chicken that may be used in the production of both eggs and meat. [42] In the past, many chicken breeds were selected for both functions. However, since the advent of laying and meat hybrids, industrial chicken breeding has made a sharp distinction between chickens with either function, [ 43 ] so that certain ...
The eggs from pasture-raised chickens have less cholesterol and more nutrients, Steele said, because of their healthier, more varied diets. Yolks are not the only thing that come in different colors.
The most common reproductive strategy for fish is known as oviparity, in which the female lays undeveloped eggs that are externally fertilized by a male. Typically large numbers of eggs are laid at one time (an adult female cod can produce 4–6 million eggs in one spawning) and the eggs are then left to develop without parental care.
People with an allergy to chicken eggs may also be allergic to other types of eggs, such as goose, duck, or turkey eggs. [2] In cooking, eggs are multifunctional: they may act as an emulsifier to reduce oil/water separation (mayonnaise), a binder (water binding and particle adhesion, as in meatloaf), or an aerator (cakes, especially angel food).
A chicken may live for 5–10 years, depending on the breed. [26] The world's oldest known chicken lived for 16 years. [27] Chickens are gregarious, living in flocks, and incubate eggs and raise young communally. Individual chickens dominate others, establishing a pecking order; dominant individuals take priority for access to food and nest sites.
Japanese researchers announced last year that healthy fertile mice had been born using eggs created from male mice's tail-tip cells. The male-derived eggs were fertilized with regular sperm, thus ...