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Girls are 9 months old. I do give them sprouts, as well as fermented feed. Vitamins are a good idea. The others are great eggs. I think from now on I will not get any hybrids, just heritage and mutts.Have your girls been laying all winter? How old are they? If they are in their first cycle, that does not speak well of Isa Browns from what ever hatchery they came from.
Interesting. I'm guessing it's related to the way these particular girls metabolize their feed. Try giving them some multi vits and see if that makes a difference. My girls are on fermented feed, with frequent addition of whole squash or sprouted barley. Occasionally a shell is a bit weaker in an older hen. But, I have to fight my way into the shells now, and it takes a lot of pressure of the spatula on the yolk to break it. (I like to flip my eggs, then break the yolk so it's not as runny when I serve it up.)
I am convinced that no matter what protein feed you are using, it is sub standard when it comes to the vitamins, especially if the bag of feed is more than a few weeks old. My flock always goes on supplements prior to collecting hatching eggs.