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What causes tiny cracks in hatching eggs?

Call duck eggs under a broody. Checked them yesterday and two had a small crack at the pointed end. Candled them and one was still alive so used some clear nail varnish on it. They are due out on the 22nd. What causes the cracks which are about 5mm long. It doesn’t look like it’s the hen, could it be the shell or the duck which laid them lacking something. Thanks

johnnyg
Tuesday, June 18th, 2019


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