None are hybrids, but the leghorn and maybe even the RIR should be pretty prolific layers, and may need the extra calcium.
I have california whites, and they gobble down oyster shell like there is no tomorrow, so even though they lay almost everyday they still have strong shells. My starlight...
I think you have to weigh out the benefits and drawbacks . I have both a rooster with gout, and some hens that have calcium/laying issues. I honestly did not know what to do, so I just switch it up and hope for the best.
Did you say that you only have hens? I personally would feed layer in the...
I've had hens that didn't get enough calcium even with layer feed. You have to see how the shells are working out, I guess. Do you have any hybrid breeds that lay really frequently? They would most likely be the ones that you would see having issues.