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The birds are large-framed, hardy and fast-growing – they may reach a body-weight of more than 3.5 kg (8 lb) in seven weeks. They have a high feed conversion ratio, are calm-tempered and fertile, and their eggs have a high rate of hatchability. [2]: 93 The white feathers make the carcass easy to clean after being plucked. [17]: 193
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. The following egg masses including shell have been calculated on the basis of the USDA sizing per dozen:
More than half the calories found in eggs come from the fat in the yolk; 50 grams of chicken egg (the contents of an egg just large enough to be classified as "large" in the US, but "medium" in Europe) contains approximately five grams of fat. Saturated fat (palmitic, stearic, and myristic acids) makes up 27 percent of the fat in an egg. [62]
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The eggs are typically white but can also be a blue-green color with thicker than normal shells. [9] They average a weight of 3.5 oz. [7] The French considered this domestic duck to represent the idea of "the Perfect Utility Duck." [9] In 1861, Mrs. Beeton said of it: The Rouen, or Rhone duck, is a large and handsome variety, of French extraction.
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Average egg size is a breadth of 42.6–44.0 mm (1.68–1.73 in), a length of 58.1–60.6 mm (2.29–2.39 in) and a weight of 61.2–66.6 g (2.16–2.35 oz). [2] The incubation period ranges from 28 to 32 days. The female does all the incubating and is abandoned by the male about 1 to 2 weeks into incubation.
The female lays seven to nine cream-coloured eggs at the rate of one per day; [12] the eggs are 55 mm × 38 mm (2.2 in × 1.5 in) in size and weigh 45 g (1.6 oz), of which 7% is shell. [19] If predators destroy the first clutch, the female can produce a replacement clutch as late as the end of July. [ 12 ]