Cloning, inbreeding, and history.
Orel
V
V
D000822:Animal Husbandry / Q000266:history; D000818:Animals; D019976:Cloning, Organism / Q000266:history; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D007178:Inbreeding; D012756:Sheep