...As a result, the genetic variability of the population increases, and the phenomenon of hybrid vigor (heterosis) is observed in the first generation of hybrids. Examples of outbreeding include the hybrid cattle and goat (intergeneric hybrid) and the hybrid horse and donkey (interspecific hybrid), but these lack fertility and only last for one generation. Crossbreeding between breeds is generally called hybridization, and since the genes of two breeding populations are brought into one population, it is often carried out to create a base population rich in genetic variation when developing a new breed. ... *Some of the terminology explanations that mention "Cataro" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…その結果,集団の遺伝的変異性が増大し,また雑種第1代には雑種強勢(ヘテローシス)の現象が認められる。異系交配の例としてはウシとヤギュウの雑種キャタロ(属間雑種)やウマとロバの雑種ラバ(種間雑種)なども作出され利用されているが,これらは繁殖力を欠いていて1代限りである。品種間の交配を一般に交雑といい,二つの繁殖集団のもつ遺伝子が一つの集団にもち込まれることになるので,新品種を育成する場合の遺伝的変異の豊かな基礎集団をつくるためにしばしば行われる。… ※「キャタロ」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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