I have heard that using layer feed can give roosters (at least chicken roos) kidney problems, leading to early death. I just prefer feeding my birds the same food. I love my rooster, and so I just wanted to be on the safe side and go with my research. Plus it costs less 🤣
I just put egg shells or oyster shells in my feeder, along with their food to get them to eat it. At the end of my hens laying season, I found a few soft eggs, but I think that is just from their body's slowing down. I tried putting oyster shells and egg shells in a bowl for them to peck at...
Another suggestion... Have you tried looking for mites or lice? I have heard that they can carry disease and can potentially kill your birds. There is this stuff ( forgot what it is called; Sorry!) That you can put in their water or down their throats. It kills any mites or lice on the bird...
I would put them on All Flock feed, because normal hen laying feed does not have the nutrients that they need, and can cause them to be sluggish and die. I hope this helps! Sorry for your losses!