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The default color of vertebrate eggs is the white of the calcium carbonate from which the shells are made, but some birds, mainly passerines, produce colored eggs. The pigments biliverdin and its zinc chelate give a green or blue ground color, and protoporphyrin produces reds and browns as a ground color or as spotting.
Balut nutrition specifications between chicken and duck have minor differences, but both eggs have around 14 grams of crude protein, 188 calories each, and around 100 milligrams of calcium. [14] A duck egg might have a higher value of nutrition than a chicken egg, but overall, both chicken and duck balut have approximately the same nutritional ...
Wood. With big fluffy plumes on the tops of their heads, Wood ducks are distinct among many other breeds. But what really sets these birds apart is the unique profile of the female duck, which ...
American Pekin flock. The Pekin or White Pekin is an American breed of domestic duck, raised primarily for meat. [6] [7] It derives from birds brought to the United States from China in the nineteenth century, [8] and is now bred in many parts of the world. [6]
The breed is known for its high egg production, but estimates of this vary widely. The Livestock Conservancy give a figure of "over 250 eggs" per year without supporting evidence. [6] Claims of as many as 300 eggs per year were published by American breeders for individual ducks in 1912–1914. [7]
This is a list of the breeds of domestic duck which have official recognition at national or international level. [1]Most breeds of duck derive from the wild mallard, Anas platyrhynchos, while a small minority are descendants of the Muscovy duck, Cairina moschata.
The Welsh Harlequin is a breed of domestic duck originating in Wales. In 1949, in Criccieth, Group Captain Leslie Bonnet discovered a colour mutation among his flock of Khaki Campbells and began selective breeding for the trait. By 1968, hatching eggs were exported to the United States, followed by the importation of live birds in 1981. [1]: 199
The Swedish Blue is a medium-sized bird: drakes weigh some 3–4 kg, ducks about 2.5–3.5 kg.It is rather shorter and broader in body shape than breeds such as the Cayuga or Orpington; [8]: 63 the body is rounded, plump and full-breasted, the back is straight and fairly flat, and is about half as long again as it is broad.