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?421Please respect copyright.PENANASew2I5qyp9
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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。421Please respect copyright.PENANAu2MVx4xsjH
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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。421Please respect copyright.PENANASNeTsfRgOH
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。421Please respect copyright.PENANA7N7rMMoGiE
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。421Please respect copyright.PENANA7TWGSyjbcT
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之後就會到達Isthmus,花費將1-2小時形成蛋殼內膜。421Please respect copyright.PENANAwXOPFSiWjW
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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。421Please respect copyright.PENANAGsKSVvJqHs
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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。421Please respect copyright.PENANA3AbOAu4eCi
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但是,這現象並沒有出現在實驗2裡頭。421Please respect copyright.PENANAoPMflRPDoK
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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;421Please respect copyright.PENANANhLieJhM66
年輕(4-12.5%)vs年長(1.12-3.53%)。421Please respect copyright.PENANAGaAfOUZeUp
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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。421Please respect copyright.PENANA5twRKZs749
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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。421Please respect copyright.PENANAPjEQ0RyJdy
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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。421Please respect copyright.PENANArrDTbFi7yG
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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。421Please respect copyright.PENANA44tPnbHTHW
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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/toc421Please respect copyright.PENANAdw4fWJ0Ghy
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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。421Please respect copyright.PENANA44Wj11AdH0
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Link:421Please respect copyright.PENANADIlVWqX1QL
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio421Please respect copyright.PENANAAcAirHTK3V
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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。421Please respect copyright.PENANAxASLkwVJv3
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Ref1:http://www2.ca.uky.edu/agcomm/pubs/ASC/ASC201/ASC201.pdf421Please respect copyright.PENANAGF96S7F5LA
Ref2:https://www.sciencedirect.com/science/article/pii/S0032579119512536421Please respect copyright.PENANAGk4YtinZAw
Ref3:https://www.tandfonline.com/doi/abs/10.1080/00439339.2020.1729671421Please respect copyright.PENANA3JePFKdDvX