Hoping you don't have to do it again either. Otherwise, echoing the very excellent advice from @casportpony . After the fact, with no birds, no pictures, no symptoms, its impossible for any of us to offer any diagnosis - just blind guesses. Had one of the birds just passed, even if the local lab couldn't necropsy (say, due to the holidays), we might assist you in a quick butchering to look for some of the more common (and obvious once inside) poultry killers, like fatty liver disease, ascites, and the like - some of which can relate to feed practice, and some have genetic components (or predispositions). Then we could ask refining questions, like "Are all the birds from the same line or hatching"?
and while I am NOT suggesting your feed is the cause without a confirming diagnosis, Sunrise Farms' non-GMO layer is 7% fat, which is very high (and above the recommendation of most sources I am aware of), though the fat recommendation for ducks and geese is higher than it is for chickens.
/EDIT Correcting myself. Their Soy-free non GMO layer is a far more reasonable 3% fat. Apologies. Number one Ingredient is peas - which have some anti-nutritive properties, but it looks like they are adding some things to compensate and are (hopefully) using low tannin, low trypsin inhibiting varieties.
and while I am NOT suggesting your feed is the cause without a confirming diagnosis, Sunrise Farms' non-GMO layer is 7% fat, which is very high (and above the recommendation of most sources I am aware of), though the fat recommendation for ducks and geese is higher than it is for chickens.
/EDIT Correcting myself. Their Soy-free non GMO layer is a far more reasonable 3% fat. Apologies. Number one Ingredient is peas - which have some anti-nutritive properties, but it looks like they are adding some things to compensate and are (hopefully) using low tannin, low trypsin inhibiting varieties.
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