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。525Please respect copyright.PENANAaTtn96mRG9525Please respect copyright.PENANAkMR7E0d8LI
525Please respect copyright.PENANAfQm9mk828f
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)。525Please respect copyright.PENANAj5Ni40g4ec
525Please respect copyright.PENANAk0p80tVEQz
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)。525Please respect copyright.PENANAY1lSngtOso
525Please respect copyright.PENANAkTdYpFTyU5
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。525Please respect copyright.PENANAMCIrgJXlJB
525Please respect copyright.PENANAnYCzppOQkq
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。525Please respect copyright.PENANAinhoYhNRcU
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。525Please respect copyright.PENANABL6ZrO8WiP
525Please respect copyright.PENANAIizzoO6Y6e
(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。525Please respect copyright.PENANAxwx2E9Ryec
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。525Please respect copyright.PENANAN1wGNSGwIF525Please respect copyright.PENANAjxV1eJSFj4
525Please respect copyright.PENANAu6aKQUg4tB
(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。525Please respect copyright.PENANAZZ8Clhue13525Please respect copyright.PENANADwZ7o3xIMT
525Please respect copyright.PENANAh47A9RgvNl
(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。525Please respect copyright.PENANAY58D4XUEOr525Please respect copyright.PENANA9ETH0I0pP9
525Please respect copyright.PENANAvvihgsNNKa
525Please respect copyright.PENANAhr9G7d4DtS
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。525Please respect copyright.PENANAut12rJVjxR
525Please respect copyright.PENANAevSp8rRq2s
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。525Please respect copyright.PENANAbNh3RuAwfN
525Please respect copyright.PENANAigzR05UGgH
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。525Please respect copyright.PENANA2bkh5YW2e6
525Please respect copyright.PENANAjKExFjO8Dt
525Please respect copyright.PENANA7GN9QT88Ed
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。525Please respect copyright.PENANAjeKD1F4x3X
525Please respect copyright.PENANAmvZsJukoY7
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/toc525Please respect copyright.PENANA9m6kZqz9MS
525Please respect copyright.PENANAwtX8SvcGXR
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。525Please respect copyright.PENANAlZEtONZgum
525Please respect copyright.PENANAK5YOjicjyN
Link:525Please respect copyright.PENANAShDlMsEacj
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio525Please respect copyright.PENANA1EvyUlJPx8
525Please respect copyright.PENANA8B07eMWO6I
525Please respect copyright.PENANAiaVxvcUsJf
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。525Please respect copyright.PENANAgHRAMZ7e0Z
525Please respect copyright.PENANAv4mHtpvvAt
Ref1:https://www.nature.com/articles/s41598-020-70531-y525Please respect copyright.PENANAxZ2sgN658b
arrow_back
科普專欄–薯不揀單
more_vert
-
info_outline 資料
-
toc 目錄
-
share 分享
-
format_color_text 介面設置
-
exposure_plus_1 推薦
-
打賞
-
report_problem 檢舉
-
account_circle 登入
X
科普專欄–薯不揀單
作者:
薯仔聞茱莉

篇 #78
深入淺出–牛究竟天生有沒有角?
喜歡 4
閱讀 521
書籤 150
campaign
催更 0
打賞

按此加載下一章
X
每次催更後,作者都會收到通知!
smartphone100 → 催更
×
寫下你喜歡這個故事的地方
×
對此喜歡的人