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Breed Purity

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Breed Purity 

the presence in animals of the characteristics typical for their particular breed. The offspring of animals belonging to the same breed are considered purebred. When animals of different breeds are mated, they produce crossbreeds of differing degrees of breed purity. The first generation of crossbreeds are considered “semipurebreds,” that is, the proportion of hereditary characteristics from each of the parent breeds in such crossbreeds is equal.

Mating a first-generation crossbreed with a purebred animal of one of the parent breeds produces a second-generation crossbreed whose breed purity is three-fourths of one parent breed and one-fourth of the other. Mating a first-generation crossbreed with a purebred animal of a third breed will produce composite crossbred progeny whose breed purity is one-half the blood of the third breed and one-fourth of each of the other two breeds. If crossbreeds are mated with purebred animals of one of the parent breeds for several generations, their breed purity increases with each generation, gradually approaching purebred. Outstanding crossbreeds of the fourth or fifth generation are considered purebreds.

Representations of breed purity by fractions are used as guidelines in breeding work.

REFERENCE

Borisenko, E. Ia. Razvedenie sel’skokhoziaistvennykh zhivotnykh, 4th ed. Moscow, 1967.

A. P. BEGUCHEV
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The present study suggested the need to set up an improvement scheme for the frequent exchange of rams among farms or flocks rearing the same breed, aimed to increase genetic diversity and maintenance of breed purity.
Genetic diversity measures of 8 local sheep breeds in northwest of ... by Zeng, X.C.; Chen, H.Y.; Hui, W.Q.; Jia, B.; Du, Y.C.; Tian, Y.Z. / Asian - Australasian Journal of Animal Sciences
Now there are more living Arabian horses in the United States than in all the other countries in the world combined and many breeders strongly support naming Arabian horses with traditional Arabian names, which to them, is as important as maintaining breed purity.
The Arabian the World's Oldest Horse Keeps Getting Better with Age by Phil Wiskell / Pets and Animals community
This whole thing gets into genetics, recessive genes and other variables that are far more important to the guardians of the breed purity than they are to me, considering that the Brittany, as well as every breed of sporting dog, is an amalgam of traits from decades, sometimes centuries of genetic tinkering.
Hair of the dog: plus, some random thoughts on public speaking by Vance, Joel M. / Gun Dog
 
 
 
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