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A scur is an incompletely developed horn growth. In cattle, scurs are not attached to the skull, whereas horns are attached and have blood vessels and nerves.〔Dove W. (1935) The physiology of horn growth: a study of the morphogenesis, the interaction of tissues, and the evolutionary processes of a Mendelian recessive character by means of transplantation of tissues. Journal of Experimental Zoology 69, 347– 405.〕 Scurs may also occur in sheep.〔Johnston SE, Beraldi D, McRae AF, Pemberton JM, Slate J. 2009. Horn type and horn length genes map to the same chromosomal region in Soay sheep. Heredity (Edinb). 104(2):196-205. doi: 10.1038/hdy.2009.109〕 ==Genetic Inheritance== The gene for scurs is inherited separately 〔Asai, M, T. G. Berryere, Schmutz, S. M. 2004. The scurs locus in cattle maps to bovine chromosome 19. Animal Genetics 35:34-39〕 from the polled gene in cattle.〔Georges, M., R. Drinkwater, T. King, A. Mishra, S.S. Moore, D. Nielsen, L.S. Sargeant, A. Sorensen, M.R. Steele, X. Zhao, J.E. Womack and J. Hetzel. 1993. Microsatellite mapping of a gene affecting horn development in Bos taurus. Nat. Genet. 3: 206-210.〕 Not all polled animals lack the scur gene. Since horned is recessive to polled,〔Long, C. R. and K. E. Gregory. 1978. Inheritance of the horned, scurred, and polled condition in cattle. J. Heredity. 69:395-400.〕 no horned cattle carry the polled allele, but they may also carry scurs. In cattle, genetic expression of the scur gene is different from that of the dominant polled gene, in that the scur gene's expression depends on the sex of the animal. The scur gene is dominant in males and recessive in females. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Scur」の詳細全文を読む スポンサード リンク
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