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Breed
A breed is a specific group of domestic animals having homogeneous appearance (phenotype), homogeneous behavior, and/or other characteristics that distinguish it from other organisms of the same species and that were arrived at through selective breeding. Despite the centrality of the idea of "breeds" to animal husbandry and agriculture, no single, scientifically accepted definition of the term exists.〔The state of the world's animal genetic resources for food and agriculture. Barbara Rischkowsky and Dafydd Pilling. Commission on Genetic Resources for Food and Agriculture. 2007〕 A breed is therefore not an objective or biologically verifiable classification but is instead a term of art amongst groups of breeders who share a consensus around what qualities make some members of a given species members of a nameable subset.〔''The Genetics of Populations''. Jay L Lush. Iowa State University Press. 1994〕
When bred together, individuals of the same breed pass on these predictable traits to their offspring, and this ability—known as "breeding true"—is a requirement for a breed. Plant breeds are more commonly known as cultivars. The offspring produced as a result of breeding animals of one breed with other animals of another breed are known as crossbreeds or mixed breeds. Crosses between animal or plant variants above the level of breed/cultivar (i.e. between species, subspecies, botanical ''variety'', even different genera) are referred to as ''hybrids''.〔Banga, Surinder S. (November 25, 1998). ''Hybrid Cultivar Development'', p. 119. Springer-Verlag. ISBN 3-540-63523-8 〕
==Animal breeds==
(詳細はウィキペディア（Wikipedia）』
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