動物的品種不同,其特徵亦會有所不同。以狗為例的話,金毛尋羊犬以及臘腸狗就是非常鮮明的例證。322Please respect copyright.PENANAgJhqqt1x4R
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至於牛隻,農場飼養用的大致分為兩種,主力出產牛奶的乳牛(Dairy Cattle)和主力屠宰成肉類出售的肉用牛(Beef Cattle)。322Please respect copyright.PENANADogbZBNvu8
322Please respect copyright.PENANA3tcxrzNkaB
各舉一例的話,前者品種例子為Holstein(荷斯坦),而後者則為較為廣泛認識的Angus(安格斯)。322Please respect copyright.PENANAnTtsvaqM0X
322Please respect copyright.PENANAlw8luEglRi
牛天生會否長角,將視乎品種而定。大多數的乳牛品種天生均長有角,而食用牛多數的品種則天生無角。322Please respect copyright.PENANAYNiHMRYaZd
322Please respect copyright.PENANAVzn8lRAV0Q
這裡讓農夫感到煩惱的是,乳牛隻會利用頭上的角互相攻擊對方甚至自己。322Please respect copyright.PENANAyVOgr3RRvg
因此慣常的做法會麻醉牛隻然後再進行除角手術,以免牛隻受傷因而損失獲利,但這做法引起動物權益成員的關注及爭議,認為此舉會對牛隻帶來創傷。322Please respect copyright.PENANAU8nv6FmMXa
322Please respect copyright.PENANAg5BhvJdAGJ
(圖2)最為有效率及一勞永逸的解決辦法,自當然就是培育沒有長角的品種,一直傳遞下去。322Please respect copyright.PENANAtUTmpldJ1L
有科學家致力尋求發現,發現牛隻基因染色體1的某一段位置的重覆區域,將會導致乳牛品種不會長出牛角。322Please respect copyright.PENANAA4Ob1jz55y
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(圖3)因此,他們嘗試抽取長角品種的皮膚細胞,利用CRISPR基因編輯技術在那段基因區域上加添重覆區域(Ref1),再經過一系列的工序,將已編輯的細胞人工培植到牛隻身上,觀察誕下的胎兒會否長出牛角。322Please respect copyright.PENANA0Oh5mios1q
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(圖4)最終所誕下的牛隻的而且確沒有長角,但因器官衰竭等問題很快便與世長辭。322Please respect copyright.PENANAgC2KJDQfbQ
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這研究確實了CRISPR技術在牛隻的應用,但顯然仍有一系列的應用問題需要改善。在這實驗中,6隻人工培植受孕的牛隻中,只有一隻成功誕下嬰兒。322Please respect copyright.PENANAyfgMIxbm8H
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至於為何不重點培育沒有長角品種的乳牛,原因是牠的產奶量較其他有角品種的最少。322Please respect copyright.PENANANKPOXm99Hp
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農父及科學家的最終目標,當然就是希望培植沒有長角而產奶量豐盛的牛隻。但這做法是否符合動物權益,這又會是一場永無休止的辯論。322Please respect copyright.PENANAdB9QDUNwWy
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如果想我快啲出文的話,請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark,這對我非常之重要。322Please respect copyright.PENANAs6DCPcxkPj
322Please respect copyright.PENANABv0r4d9zdQ
Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc322Please respect copyright.PENANAhnCFyax5zR
322Please respect copyright.PENANAxzDw9TkxjE
同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」,以課金的方式推動我繼續搜羅資料寫文,多謝。322Please respect copyright.PENANA6k60dthsOP
322Please respect copyright.PENANAGpYnpG5HBR
Link:322Please respect copyright.PENANAo7ze8ee5bK
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio322Please respect copyright.PENANAVCZy7TWfmi
322Please respect copyright.PENANAtk60JI4cLO
322Please respect copyright.PENANAw5M2byWNre
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。322Please respect copyright.PENANAgldjXWJ6BP
322Please respect copyright.PENANAJ6BXzhNi6e
Ref1:https://www.nature.com/articles/s41598-020-70531-y322Please respect copyright.PENANAHEUj2248qi
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #78
深入淺出–牛究竟天生有沒有角?
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