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T.G
Joined: 13 Sep 2009 Posts: 7280 Location: Somewhere you're not
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SandraR
Joined: 22 Oct 2006 Posts: 2346 Location: Devon
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Sonny
Joined: 12 Apr 2010 Posts: 24 Location: South Lincs
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chez
Joined: 13 Aug 2006 Posts: 35934 Location: The Hive of the Uberbee, Quantock Hills, Somerset
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Sonny
Joined: 12 Apr 2010 Posts: 24 Location: South Lincs
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Posted: Fri Apr 16, 10 6:53 pm Post subject: |
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Soon after an egg is laid, a small air bubble forms in the large end under the shell. A membrane separating the mass of the egg and the air bubble serves as a diaphragm to relieve stress and pressure resulting from thermal changes of temperature. The drier the ambient air is, naturally the more fluid is depleted and the faster the bubbles grows. Correct humidity insures that the bubble does not grow to a certain degree by the time the embryo is ready to hatch, but that the air bubble does not enlarge to the point of depleting the fluids that are necessary for the final growth of the embryo. The importance of correct humidity is more apparent at the end of incubation. The normal condition is that the bubble has enlarged to the point where the chick can reach his beak through the membrane wall and pick around the shell breaking the bubble area off as a door. If humidity has been excessive, the chick may not reach the bubble but will pip the shell in the fluids under the bubble and may drown at that moment, before he is able to go any further with his effort to release himself from the confines of the egg. On the other hand, if humidity has been too low, the bubble will be oversized and the fluids under it will have dehydrated to the point where final development of the embryo will be retarded and the chick may become stuck to the shell when it pips. In this condition, the chick will exhaust itself but will not be able to get out of the shell. After half a day, a chick that is stuck to the shell, after pipping, may be relieved by pulling the top of the shell off. |
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Ginkotree
Joined: 26 Jun 2008 Posts: 2956 Location: south west wales
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Sonny
Joined: 12 Apr 2010 Posts: 24 Location: South Lincs
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Ginkotree
Joined: 26 Jun 2008 Posts: 2956 Location: south west wales
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pookie
Joined: 01 Aug 2006 Posts: 4984 Location: Mid-Wales
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SandraR
Joined: 22 Oct 2006 Posts: 2346 Location: Devon
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Ginkotree
Joined: 26 Jun 2008 Posts: 2956 Location: south west wales
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T.G
Joined: 13 Sep 2009 Posts: 7280 Location: Somewhere you're not
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Ginkotree
Joined: 26 Jun 2008 Posts: 2956 Location: south west wales
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SandraR
Joined: 22 Oct 2006 Posts: 2346 Location: Devon
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Ginkotree
Joined: 26 Jun 2008 Posts: 2956 Location: south west wales
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