科普專欄–薯不揀單 - 三十秒科學–雞蛋出現雙黃是天然或是人為？

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?520Please respect copyright.ＰＥＮＡＮＡ0Ftt457gGO
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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。520Please respect copyright.ＰＥＮＡＮＡiJUV6m5lec
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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。520Please respect copyright.ＰＥＮＡＮＡtOBXY1EWPz
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。520Please respect copyright.ＰＥＮＡＮＡg1tCwv81kc
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。520Please respect copyright.ＰＥＮＡＮＡYhVYY0NqYG
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之後就會到達Isthmus，花費將1-2小時形成蛋殼內膜。520Please respect copyright.ＰＥＮＡＮＡliqoqyOGAN
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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。520Please respect copyright.ＰＥＮＡＮＡasmf0bICNm
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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。520Please respect copyright.ＰＥＮＡＮＡWY2rdOuX4D
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但是，這現象並沒有出現在實驗2裡頭。520Please respect copyright.ＰＥＮＡＮＡxWgdBx9kOz
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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;520Please respect copyright.ＰＥＮＡＮＡppBGsOFqZx
年輕(4-12.5%)vs年長(1.12-3.53%)。520Please respect copyright.ＰＥＮＡＮＡ2FZ1ukUC3K
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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。520Please respect copyright.ＰＥＮＡＮＡM378VBwqOT
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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。520Please respect copyright.ＰＥＮＡＮＡSxTi3C0I9F
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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。520Please respect copyright.ＰＥＮＡＮＡaPnscX4Vj3
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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。520Please respect copyright.ＰＥＮＡＮＡ5LyzssIbqI
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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/toc520Please respect copyright.ＰＥＮＡＮＡdAubb3rK86
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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。520Please respect copyright.ＰＥＮＡＮＡX07OvMH6Ci
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https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio520Please respect copyright.ＰＥＮＡＮＡj6Ga6f3aAD
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Ref1:http://www2.ca.uky.edu/agcomm/pubs/ASC/ASC201/ASC201.pdf520Please respect copyright.ＰＥＮＡＮＡBkcwHwnaU3
Ref2:https://www.sciencedirect.com/science/article/pii/S0032579119512536520Please respect copyright.ＰＥＮＡＮＡaF8r6EtnNS
Ref3:https://www.tandfonline.com/doi/abs/10.1080/00439339.2020.1729671520Please respect copyright.ＰＥＮＡＮＡMHfuvhefqx

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