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Selective breeding of both plants and animals has been practiced since prehistory; key species such as wheat, rice, and dogs have been significantly different from their wild ancestors for millennia, and maize, which required especially large changes from teosinte, its wild form, was selectively bred in Mesoamerica.
Boar–pig hybrids, which are hybrids of wild boars and domestic pigs and exist as an invasive species throughout Eurasia, the Americas, Australia, and in other places where European settlers imported wild boars to use as game animals, are also used for selective breeding to re-create the type of pigs represented in prehistoric artworks dating ...
In order to be considered fully domesticated, most species have undergone significant genetic, behavioural and morphological changes from their wild ancestors, while others have changed very little from their wild ancestors despite hundreds or thousands of years of potential selective breeding. A number of factors determine how quickly any ...
[1] [2] A puppy from two purebred dogs of the same breed, for example, will exhibit the traits of its parents, and not the traits of all breeds in the subject breed's ancestry. Breeding from too small a gene pool, especially direct inbreeding , can lead to the passing on of undesirable characteristics or even a collapse of a breed population ...
Usually, the breeding companies conduct progeny testing of their bulls so that they can be commercially promoted. But when the breeding organisations are Government controlled (e.g. India), the onus of conducting the testing also lies with them if required genetic improvement is to be achieved. [2]
Selective breeding has been responsible for large increases in productivity. For example, in 2007, a typical broiler chicken at eight weeks old was 4.8 times as heavy as a bird of similar age in 1957, [36] while in the thirty years to 2007, the average milk yield of a dairy cow in the United States nearly doubled. [36]
Animal breeding is a branch of animal science that addresses the evaluation (using best linear unbiased prediction and other methods) of the genetic value (estimated breeding value, EBV) of livestock. Selecting for breeding animals with superior EBV in growth rate, egg, meat, milk, or wool production, or with other desirable traits has ...
The dogs were never deliberately or specifically bred to a standard, but human selective breeding and natural selection still came-into play. European explorers, like Captain Cook, encountered "pot-bellied, short-legged" poi dogs that freely associated with the kept hogs in the villages.