article_snippet.sent: While the instance is extremely rare, the instance’s caused when the hen is in the process of forming an egg in the hen oviduct and another oocyte – the ovum or egg cell that becomes the yolk of the egg – is released too soon.
article_snippet.sent: This is when a second oocyte (yolk) is released by the hen's ovary before the over-sized egg that was laid by one of his hens has completely traveled through the oviduct and been laid.
article_snippet.sent: When a second oocyte (yolk) released, the first is in the eggshell-gland portion of the oviduct, were the shell is made.
article_snippet.sent: This means that the over-sized egg that was laid by one of his hens is added to the second oocyte, which then travels down the oviduct and is covered in a shell, creating a giant egg around the first one.
article_snippet.sent: A hen releases an oocyte from A hen left ovary into A hen every 18 to 26 hours, Back Yard Poultry Mag explained.
article_snippet.sent: Usually, a second oocyte (yolk) travels down the oviduct, adding layers of the egg until a second oocyte (yolk)’s laid through the hen’s vent.
article_snippet.sent: But in a counter-peristalsis contraction, a second oocyte is released by the hen's ovary before the over-sized egg that was laid by one of his hens has completed a second oocyte journey.
article_snippet.sent: When a second oocyte released, the first is in the eggshell-gland portion of the oviduct, were the shell is made.
article_snippet.sent: This means that the over-sized egg that was laid by one of his hens is added to the second oocyte, which then travels down the oviduct and is covered in a shell, creating a giant egg around the first one.
article_snippet.sent: In a counter-peristalsis contraction, a second oocyte is released by the hen's ovary before the first egg has completed its journeya second oocyte .
article_snippet.sent: This results in an egg with another made inside This, producing two yolks (pictured)
highlights_snippet.sent: Phenomenon is caused when an oocyte - which becomes a yolk - is released too soon and merges with an earlier egg that hasn't been laid .