Try some oyster shells that's what we did when we used to get soft eggs and now their all hard!
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. Here is an egg (well, two) that are both rubber and attached by a tube. We are getting regular rubber eggs from one of our 12 hens. Don't know who as they are free range and share nesting boxes. Confused as to what to do as we have lots if oyster shells and good feed. All other eggs are normal.
Please remember we are dealing with the chicken's reproductive system. I had 1 hen that didn't start laying until a few weeks after her sisters. I finally figured out that she might not be the same age as the others that I got when I got her. So, I just watched her. She finally laid an egg. No shell found, just the egg under the roost. I kept an watchful eye on her and she finally started laying in the same nesting box as the other 3. It was like she watched them and finally joined in the fun. Henny has a different laying cycle than the other 3. She lays for 6 or 7 days straight, then she takes a day off to rest. Her eggs are just like the others. From what I could find on here, that could be a normal laying cycle for her.I got the exact same thing today. My white leghorn pullet just started laying two months ago and she has been a very consistant layer but her egg shells are a lot thinner compared to my other pullets and hens. I bought some free choice oyster shell and put it in the coop so she could eat it if she needed it. That was about a week ago. Today I found a white egg on top of the small coop, inside the run. The shell was so thin that it cracked when I picked it up. My lab got it as a treat