一隻雞蛋裡頭有雙蛋黃,究竟是人為所致還是天然隨機發生的呢?585Please respect copyright.PENANAtS1abhuYW5585Please respect copyright.PENANAKrT6h67TAV
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(圖2)在回答之前,我們需要了解一下雞蛋在母雞裡生產的過程。585Please respect copyright.PENANAOld4TeSMse585Please respect copyright.PENANA4M8r1o63mw
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當卵子從卵巢(Ovary)排出後,便會在Infundibulum逗留約15-30分鐘。585Please respect copyright.PENANAk0XanlEHJb
若果在此時遇上精子的話,便會進行受精,生出來的雞蛋有機會可孵出小雞。585Please respect copyright.PENANARlq1f4tcRW
不過無論受精與否,卵子隨後便抵達Magnum,在該位置的細胞會釋出各種蛋白質,圍繞著卵子的蛋黃製作蛋白,這過程歷時約2-3小時。585Please respect copyright.PENANA2b0Pwts294
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之後就會到達Isthmus,花費將1-2小時形成蛋殼內膜。585Please respect copyright.PENANAnjxypAWcMm
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最後就會來到Shell gland,逗留接近18-22小時,形成含豐富鈣質(鈣質佔蛋殼95%成份)的蛋殼,這同時亦是坊間為何經常利用蛋殼作施肥的原因。585Please respect copyright.PENANAF1EqMfzwvo
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(圖3)有科學家對雞隻進行實驗。在實驗1裡頭,往雞隻增加注射雌激素的話,雞蛋出現雙黃的機率亦會隨之增加。585Please respect copyright.PENANA73Hi7Ij7P1585Please respect copyright.PENANAALKLM9nBn6
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但是,這現象並沒有出現在實驗2裡頭。585Please respect copyright.PENANAyu4t4enUWa
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文中作者表示實驗1所用的雞隻較實驗2的為年輕足足一個月有多,而同時的確亦有不同證據(Ref3)指出年輕雞隻所生的雞蛋出現雙黃的機率亦較高;585Please respect copyright.PENANAZROLmqE5Hk
年輕(4-12.5%)vs年長(1.12-3.53%)。585Please respect copyright.PENANAHZjzkgGOkw
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這相信是年輕母雞的排卵及生產雞蛋的機制尚未完善,例如不經意地造就雙黃聚在一起共同在Magnum製作蛋白等,因而造就雙黃情況。585Please respect copyright.PENANAL8NpnPY85k
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之於荷爾蒙方面,雌激素能刺激雞隻肝臟製作更多釀成蛋黃及脂肪的原料,在年輕雞隻中亦能增加生產錯誤的機率,釀成雙黃局面。585Please respect copyright.PENANAluoPdUgort
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但相信基於是年老的母雞已發展出完善的排卵程序、又或是對雌激素已失去敏感度,出現雙黃的機率並不沒有受雌激素影響得到。585Please respect copyright.PENANAKDbTaYNXXk
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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。585Please respect copyright.PENANARguT5Pr9WQ
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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/toc585Please respect copyright.PENANAg21dMhP3xj
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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。585Please respect copyright.PENANAxNXTPnLaLv
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Link:585Please respect copyright.PENANAuXAYACRy2H
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio585Please respect copyright.PENANA7NXVGoUxST
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除非Facebook及IG重開侵侵的account,否則我的IG將不會再作更新,只會寄居本土LIHKG及Penana。585Please respect copyright.PENANArKMBMJvgTM
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Ref1:http://www2.ca.uky.edu/agcomm/pubs/ASC/ASC201/ASC201.pdf585Please respect copyright.PENANAmKAm7VxOSa
Ref2:https://www.sciencedirect.com/science/article/pii/S0032579119512536585Please respect copyright.PENANAW9RdyTgLhu
Ref3:https://www.tandfonline.com/doi/abs/10.1080/00439339.2020.1729671585Please respect copyright.PENANAQ1hM5HJd8V