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Ridged Eggs

post #1 of 2
Thread Starter 

My two year old hen is laying hard shelled eggs, but with ridges around it.  The ridges are getting more pronounced and deeper.  She is on a premium diet and has a bowl of oyster shell always available.  Again, the shells are not soft; they are very hard.

 

 

post #2 of 2

There can be many reasons for this type of egg shell such as sub-clinical infectious bronchitis, defective shell gland, too much calcium, copper deficiency, heredity, and other reasons. I have one that lays one every other day. Here is some reading about eggs: 

http://www.backyardchickens.com/a/common-egg-quality-problems

https://www.alltech.com/sites/default/files/alltech-egg-shell-quality-poster.pdf

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