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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.
The term vitellogenesis comes from the Latin vitellus ("egg yolk"). Yolk proteins, such as Lipovitellin and Phosvitin, provides maturing oocytes with the metabolic energy required for development. Vitellogenins are the precursor proteins that lead to yolk protein accumulation in the oocyte.
Eggs of various birds, a reptile, various cartilaginous fish, a cuttlefish and various butterflies and moths. (Click on image for key) Diagram of a fertilized chicken egg in its ninth day. Membranes: allantois, chorion, amnion, and vitellus/yolk. Six commercial chicken eggs — view from the top against a white background
Vitellin is a protein found in the egg yolk.It is a phosphoprotein. [1] Vitellin is a generic name for major of many yolk proteins. [2]Vitellin has been known since the 1900s. [3]
The vitellus, or yolk, is the nutrient-bearing portion of the egg, containing most of its fat, minerals, and many of its proteins and blood vessels The albumen is made up of globular proteins called ovalbumin which contain over half of the egg's protein; its function is considered unknown
Bird and reptile eggs consist of a protective eggshell, albumen , and vitellus , contained within various thin membranes. The egg yolk is suspended in the egg white by one or two spiral bands of tissue called the chalazae (from the Greek word χάλαζα, meaning 'hailstone' or 'hard lump
Bird and reptile eggs consist of albumen and vitellus , contained within many different thin membranes all surrounded by a protective eggshell. Popular choices for egg consumption are chicken , duck , quail , roe , caviar , and emu .
Vitellogenin provides the major egg yolk protein that is a source of nutrients during early development of egg-laying vertebrates and invertebrates.Although vitellogenin also carries some lipid for deposition in the yolk, the primary mechanism for deposition of yolk lipid is instead via VLDLs, at least in birds and reptiles. [4]