Search results
Results from the WOW.Com Content Network
Equally important, embryologists can carry out experiments on such embryos, close the egg again and study the effects later in development. For instance, many important discoveries in limb development have been made using chicken embryos, such as the discovery of the apical ectodermal ridge and the zone of polarizing activity. [101]
The Romans used them in divination, and the Egyptians made a breakthrough when they learned the difficult technique of artificial incubation. [27] Since then, the keeping of chickens has spread around the world for the production of food with the domestic fowl being a valuable source of both eggs and meat. [28]
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 characteristics have been promoted to an extreme degree. Partly due to the discussion about male offspring ...
Galliformes / ˌ ɡ æ l ɪ ˈ f ɔːr m iː z / is an order of heavy-bodied ground-feeding birds that includes turkeys, chickens, quail, and other landfowl.Gallinaceous birds, as they are called, are important in their ecosystems as seed dispersers and predators, and are often reared by humans for their meat and eggs, or hunted as game birds.
Battery hens: poultry is a major source of food, the chicken alone providing 20% of the world's animal protein. [7] Birds have been domesticated and bred as poultry for use as food for at least four thousand years. The most important species is the chicken.
The red junglefowl was the primary species to give rise to today's many breeds of domesticated chicken (G. g. domesticus); additionally, the related grey junglefowl (G. sonneratii), Sri Lankan junglefowl (G. lafayettii) and the Javanese green junglefowl (G. varius) have also contributed genetic material to the gene pool of the modern chicken ...
The post 30 of the Funniest “Why Did the Chicken Cross the Road” Jokes appeared first on Reader's Digest. Not that funny. We've got some way better reasons for chickens (and lots of other ...
Modern varieties of chicken such as the Cornish Cross, are bred specifically for meat production, with an emphasis placed on the ratio of feed to meat produced by the animal. The most common breeds of chicken consumed in the U.S. are Cornish and White Rock. [16] Chickens raised specifically for food are called broilers. In the U.S., broilers ...