Egg shells that are too thin crack and break easily. 
Often the egg either dries out or prematurely indents or breaks with a developing chick inside. 
Good shells are firm and smooth.  I use Natural vitamineral, a pigeon product, in all hen cages and when the hen lays her first egg of each clutch, I also start her on avi-tech Cal-D-Solve till she finishes each clutch.
I am totally in love with this begonia!
 
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