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Monday, June 23, 2008
澳壁虎藏身鸡蛋 从鸡屁股爬进母鸡体内?

 

 

 

蛋壳中惊现小壁虎

蛋壳中惊现小壁虎

几个世纪来人们都在为"先有蛋还是先有鸡"争论不休,但这是一个似乎永远也说不清的问题。而澳大利亚科学家近日又面临一个新的不解之谜:一只小壁虎是如何跑到一枚鸡蛋中去的呢?

据英国《每日电讯报》5月17日报道,上周早些时候,家住澳大利亚达尔文的彼得・博蒙特医生正在做晚餐,突然在一枚打开的鸡蛋中惊奇地发现一只死了的壁虎!博蒙特回忆说:"我当时正在把鸡蛋打碎放进平底锅中,突然注意到其中一个蛋糊成一团,我一看蛋壳,发现一只小壁虎居然在里面!"

博蒙特表示,这只小壁虎不可能是在鸡蛋被打碎后进入蛋壳中的,因为它位于鸡蛋壳的内部和蛋壳膜之间。他认为,这只小壁虎是从鸡屁股爬入母鸡体内,以鸡胚胎为食,结果它被困在最终形成的鸡蛋中死亡。博蒙特说:"如果你剖开一只鸡,有时你会看到快要形成的鸡蛋。这只小壁虎可能跑到母鸡体内找吃的,结果却被陷在里面丢了小命。"

现年60岁的博蒙特医生是澳洲北方(Northern Territory)医学会的主席,他表示自己这次不同寻常的发现可能是世界首次。目前他已经将藏有壁虎的鸡蛋壳等上交给当局有关负责人,专家们将进行研究试图发现这只小壁虎究竟是如何进入鸡蛋里的。

"澳大利亚蛋品公司"(Australian Egg Corporation)表示,鸡蛋中发现其他动物实属罕见,之前从来没有听说过类似事件。该公司研发部经理戴维・威特科姆表示认同博蒙特医生的观点。他说:"这只壁虎肯定不会是母鸡吞下去的,它不可能从消化道进入鸡蛋生成的地方,因此小壁虎实际上是从鸡的泄殖腔进入其体内并爬到正在生成的鸡蛋上的。"(李卉)

相关知识:鸡蛋在鸡体内是怎样形成的呢?

母鸡的生殖器官主要构造有两部分,卵巢一对成结节状,输卵管一对,包括喇叭部、蛋白分泌部、峡部、子宫部及泄殖腔。其中只有一侧的卵巢和输卵管正常发育,具有繁殖机能。一个卵巢有数百万枚卵泡,但仅有少数能成熟排卵。每个卵泡含有一个卵母细胞或生殖细胞。未受精的蛋,生殖细胞在蛋形成过程中一般不再分裂,打开鸡蛋后蛋黄表面有一白点,叫胚珠。卵泡上有许多血管,自卵巢上送来营养供卵子成长发育。卵巢上每一个卵泡包含一个卵子。卵泡成熟后,自卵泡缝痕破裂排出卵子,排出的卵子在未形成蛋前叫卵黄,形成蛋后叫蛋黄。

卵泡成熟排出卵黄后,立即被输卵管喇叭部纳入。约经18分钟,进入蛋白分泌部,这里有很多腺体,分泌蛋白,包围卵黄。由于输卵管蠕动作用,推动卵黄在输卵管内旋转前进。在蛋白分泌部(也叫膨大部),因机械旋转,引起这层浓蛋白扭转而形成系带。然后分泌稀蛋白,形成内稀蛋白层,再分泌浓蛋白形成浓蛋白层。最后再包上稀蛋白,形成外稀蛋白层。卵在蛋白分泌部停留约3小时,在这里形成浓厚粘稠状蛋白。蛋白分泌部的蠕动促使包有蛋白的卵进入峡部(管腰部),在此处分泌形成内外蛋壳膜。

卵进入子宫部,约存留18至20小时,由于渗入子宫液使蛋白的重量增加一倍,同时使蛋壳膜鼓胀而形成蛋的形状。以碳酸钙为主要成分的硬质蛋壳和壳上胶护膜都是在离开子宫前形成。卵在子宫部已形成完整的鸡蛋。蛋到达阴部,约存留20至30分钟,子宫肌肉收缩,使鸡蛋自泄殖腔产出。

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