著者

横濱 道成 石田 生男 Michinari Yokohama Ishida Ikuo

巻号頁・発行日

vol.52, no.1, pp.76-81,

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わが国のサラブレッド種における白毛の個体は1979年に出現しているが,その遺伝的様式が不明なまま血統登録されることとなった。白毛の遺伝については,優性白遺伝子(W)とサビノ遺伝子(S)の2説が報告されているが,後者の遺伝子は交配データを用いた解析が実施されないまま仮定されていた。そこで本報告では,わが国のサラブレッド種に出現した白毛の家系調査を実施した結果,それは不完全優性のS遺伝子がホモ型になった場合に発現されることが確認された。またS/s型は刺毛や大きな白徴が特徴となるサビノ毛色を表現するが,その発現には大きなバラツキが存在する。

著者

Mioko MASUDA Junko TSUNODA Hiroko NOMURA Nami KIMURA Gombojav ALTANGEREL Bandi NAMKHAI Usukhjargal DOLJ Michinari YOKOHAMA

出版者

Japanese Society of Equine Science

雑誌

Journal of Equine Science (ISSN:13403516)

巻号頁・発行日

vol.18, no.4, pp.145-151, 2007 (Released:2008-01-09)

参考文献数

16

被引用文献数

2

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The incidence of Bider (Bi marking) in Mongolian native horses was 0.010, and that according to districts was the highest (0.032) in Tov Aimag. Bi marking was frequently observed in bay (0.482) and chestnut horses (0.351), and was also observed in gray and roan horses. The incidence of Bi marking was high (0.842) in horses with a dorsal strip (DS) as a primitive marking. In 164 Equus przewalskii, the incidence of Bi marking was 0.396, which was about 40 times the incidence in Mongolian native horses. Bi marking was observed in both males and females in the two species, showing autosomal inheritance. Analysis of the mode of inheritance based on the incidence of Bi marking in foals according to various crossing combinations showed the complete dominance of Bi marking in both species. Thus, it was concluded that Bi marking occurs in Bi/Bi and Bi/- genotypes. This Bi marking differs from DS, leg stripes (LS) and shoulder stripes (SS), and is considered to be a type of primitive marking peculiarly occurring in Mongolian native horse and Equus przewalskii. The high incidence of Bi marking in Equus przewalskii (0.396), and the results of crossing between Mongolian native horses and Equus przewalskii performed in Mongolia, suggest introgression of the Bi marking gene from Equus przewalskii to Mongolian native horses.