I didn't look too far but thepoultrysite.com mentioned:
stress
defective or immature shell glands
Disturbances causing eggs to be laid before the calcification of the shell is complete
poor nutrition
saline water
some diseases will cause this
How old is the other hen, is she dominant, how long have they been together? Maybe when she was sick it affected her egg laying ability…..
stress
defective or immature shell glands
Disturbances causing eggs to be laid before the calcification of the shell is complete
poor nutrition
saline water
some diseases will cause this
How old is the other hen, is she dominant, how long have they been together? Maybe when she was sick it affected her egg laying ability…..