This loss of genetic diversity extends to individual breeds, most dramatically in the Holstein. Through artificial insemination, a few bulls are responsible for the vast majority of Holstein pregnancies. Two bulls, a father and son, are responsible for 7 percent of the genomes of the entire American population of Holsteins; genetic diversity be damned.
タグ: science, genetics, farming

"Richard C. Francis"の他の名言

During much of the Paleolithic, reindeer were a primary food source for Eurasians, but judging by the relative scarcity of their representations in cave paintings, they were not as highly respected as aurochs, horses, and bison. They don't seem to have been deemed sacred. By the time domestication commenced, that attitude had changed, as evidenced by the Bronze Age megaliths depicting flying reindeer—a motif that still figures prominently in the religion of contemporary Siberian tribes such as the Evenki and Eveny. Some believe that Santa's flying reindeer ultimately derive from these myths. I don't, but I have been called Scrooge more than once.
タグ: science, santa-claus, ice-age
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