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Sex-links come in several varieties. As hybrids of laying or dual-purpose breeds infused with extra vigor via heterosis, sex-links can be extremely good egg-layers which often produce 300 eggs a year or more depending on the quality of care and feed. The color of their eggs vary according to the mix of breeds, and blue-green eggs are possible.
This method works for hatching eggs from sex-linked breeds where male and female birds have different color plumage, all males white-feathered and all females brown-feathered for example, [38] and can take place from the 13th day of the hatching process. [39] AAT's goal is to eventually be able to sex eggs at the 4th day. [34]
In 1946, the competition began with state contests. Farmers and breeders brought hatching eggs to purpose-built facilities where the chicks were hatched and then raised in controlled conditions. The chicks' rate of growth and health was monitored for 12 weeks. They were then slaughtered, weighed, and judged on the basis of edible meat produced. [5]
Vent sexing in Wenchang, Hainan, China (2014). Vent sexing, also known simply as venting, involves squeezing the feces out of the chick, which opens up the chick's anal vent (called a cloaca) slightly, allowing the chicken sexer to see if the chick has a small "bump", which would indicate that the chick is a male.
In Canada, the National Farm Animal Care Council (Conseil National Pour Les Soins Aux Animaux D'Elevage) publishes the Code of Practice for the Care and Handling of Hatching Eggs, Breeders, Chickens and Turkeys, [23] (2016, amended from time to time), which is mentioned in the Health of Animals Regulations section 72.5(1) [24] as the ...
A dual-purpose chicken is a type of chicken that may be used in the production of both eggs and meat. [42] In the past, many chicken breeds were selected for both functions. However, since the advent of laying and meat hybrids, industrial chicken breeding has made a sharp distinction between chickens with either function, [ 43 ] so that certain ...
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