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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.
Medium white eggs in carton. Chicken eggs are graded by size, for the purpose of sales. The egg shell constitutes 8–9% of the weight of the egg (calculated from data in Table 2, F. H. Harms). [1] A scale for grading eggs. An egg scale that was patented in 1924
The Duclair duck is a type of Rouen duck and is also described as resembling the Swedish Blue. Males weigh up to 6.6 pounds (3.0 kg) and females up to 5.5 pounds (2.5 kg). There are two color varieties, black and a less common blue. Both have a single white feather on each wing and a white bib.
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Aylesbury and Rouen ducks were famous throughout the nineteenth century, and these were supplemented or replaced, after 1873–74, by importation from China of the Pekin duck. As soon as the Indian Runners became fashionable, a demand for egg-layers and general purpose breeds developed.
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They are reared principally for meat, but also for duck eggs. [13]: 258 Duck husbandry is simplified by aspects of their behaviour, including reliable flocking and the ability to forage effectively for themselves in wetlands and water bodies. [12] Most breeds of duck may lay some 200 eggs per year, [13]: 258 though the Indian Runner may produce ...