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The United States Department of Agriculture sizing is based by weight per dozen. [4] The most common U.S. size of chicken egg is 'Large' and is the egg size commonly referred to for recipes.
Ostrich eggs are the largest of all eggs, [4] 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 kilograms (3.1 lb), over 20 times the weight of a chicken's egg and only 1 to 4% the size of the female. [5]
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.
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Due to the large size of the yolk, the cell division can not split up the yolk mass. The fetus instead develops as a plate-like structure on top of the yolk mass, and only envelopes it at a later stage. [7] A portion of the yolk mass is still present as an external or semi-external yolk sac at hatching in many groups.
Egg yolk: 1085 Caviar: 588 Fish oil, menhaden: 521 Foie Gras: 515 Roe: 479 Egg: 373 Lamb kidney: 337 Pork liver: 301 Clarified butter; Ghee: 256 Butter: 215 Oyster: 206 Lobster: 200 Pate: 150 Heavy whipping cream: 137 Crab meat (Alaskan King) 127 Shrimp: 125 Light whipping cream (30-36% fat) 111 Cream cheese: 110 Yellow cheese (about 1 cup) 108
The yolk of the eggs have not yet fully solidified. Eggs contain multiple proteins that gel at different temperatures within the yolk and the white, and the temperature determines the gelling time. Egg yolk becomes a gel, or solidifies, between 61 and 70 °C (142 and 158 °F). Egg white gels at different temperatures: 60 to 73 °C (140 to 163 °F).
Egg size tends to be proportional to the size of the adult bird, [citation needed] from the half gram egg of the bee hummingbird to the 1.5 kg egg of the ostrich. Kiwis have disproportionately large eggs, up to 20% of the female's body weight. [ 18 ]