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?475Please respect copyright.ＰＥＮＡＮＡO0sdZOAeBy
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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。475Please respect copyright.ＰＥＮＡＮＡSCXUhBVUFt
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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。475Please respect copyright.ＰＥＮＡＮＡh6hE1SYDQs
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。475Please respect copyright.ＰＥＮＡＮＡH8x0wvbCp5
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。475Please respect copyright.ＰＥＮＡＮＡHgsyvI1kqY
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之後就會到達Isthmus，花費將1-2小時形成蛋殼內膜。475Please respect copyright.ＰＥＮＡＮＡBKM0fQjVtB
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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。475Please respect copyright.ＰＥＮＡＮＡkM7RoPm7RL
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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。475Please respect copyright.ＰＥＮＡＮＡmoEheEcsBl
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但是，這現象並沒有出現在實驗2裡頭。475Please respect copyright.ＰＥＮＡＮＡwwWKPTuT5E
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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;475Please respect copyright.ＰＥＮＡＮＡEkgTyYMKdT
年輕(4-12.5%)vs年長(1.12-3.53%)。475Please respect copyright.ＰＥＮＡＮＡR6LKAzL5gd
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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。475Please respect copyright.ＰＥＮＡＮＡInkrGKRXmt
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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。475Please respect copyright.ＰＥＮＡＮＡoa2oib5fAK
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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。475Please respect copyright.ＰＥＮＡＮＡz90zWxhqpl
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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。475Please respect copyright.ＰＥＮＡＮＡ7gu71ZfXek
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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/toc475Please respect copyright.ＰＥＮＡＮＡVyoja1AkEq
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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。475Please respect copyright.ＰＥＮＡＮＡdvLqM0ph3U
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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/portfolio475Please respect copyright.ＰＥＮＡＮＡQNxRgjafG2
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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。475Please respect copyright.ＰＥＮＡＮＡDAgnl7gYNI
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Ref1:http://www2.ca.uky.edu/agcomm/pubs/ASC/ASC201/ASC201.pdf475Please respect copyright.ＰＥＮＡＮＡPnZWiHqXud
Ref2:https://www.sciencedirect.com/science/article/pii/S0032579119512536475Please respect copyright.ＰＥＮＡＮＡlYXjNbcM5m
Ref3:https://www.tandfonline.com/doi/abs/10.1080/00439339.2020.1729671475Please respect copyright.ＰＥＮＡＮＡE3g2Ob8FXu

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