And your advice to her to determine which bird(s) are laying the thin-shelled eggs? Surely she shouldn't have to kill them all if only one bird is having this problem. That seems extreme.
Of course, she could build a trapnest (if she had the skills to do so) which would tell her, but in the meantime, if she can find something to assist the bird, it would be useful to know which one it was having the problem. What do you recommend to tell which one it is?
And fwiw, I would not kill a bird that was having this particular problem, as it is not necessarily a sigh of weakness or illness, it is sometimes just a side effect of molt. I do agree that sick birds are not coddled here, they are culled. But this is not always a sign of illness. A soft-shelled egg can accompany illnesses such as IB, but sometimes it's just a bird that's molting.
I don't think I would immediately begin killing birds just because I saw such a thing happening.
I don't know how she has things set up; I can tell which hens are which in my flock and if the problem persists*; sure I had a young pullet or two have this problem with a single egg or two. But a proper diet will ensure it is taken care of. You asked my opinion and there it is. If you don't like it then don't use it. There is always more than one way to do things and my results have proven themselves. I realize that not everyone has 40 or so females at there disposal so I can understand the reluctance to cull if the numbers are limited. That is a decision one has to make for themselves.
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