Hi there, hope you are enjoying BYC!
Very sorry for your loss!
Some pullets have multi yolker eggs that are indeed way to large to pass and unfortunately egg binding is often deadly fast. Plus there are many reproductive disorder that can happen.
It's possible you have only 6 layers.. but entirely possible you have many more than that and they don't lay EVERY day.. Some first time layers will as well as many sex links. Many brown layers will slow to 3 or 4 eggs per week once mature.. and influenced heavily by number of daylight hours.
I used to use layer feed because I was told my birds would die if I didn't!
Since learning the difference and switching to flock raiser with oyster shell free choice on the side.. my older birds enter molt less harshly and return to molt sooner.. The difference in personality during this time since making the switch was also tremendous.. the flock raiser is higher in amino acids, the birds are stronger, my family gets more nutrients in the eggs we consume.. 16% protein in most "layer" feed is considered close to the minimum to keep a light bodied layer like Leghorn in good condition. Most larger bodied birds and even the Leghorns will benefit from a little more than the minimum.. which also goes a long way towards supporting overall immunity.. to ward of parasites etc.
One final note.. the excess calcium (>3%) should not be fed LONG term to birds NOT in lay.. will have the MOST impact on those
genetically predisposed somehow to the liver/kidney issues.. Most folks will NEVER know why their older rooster dies, nor will they pay to find out why in most cases. They'll presume heart attack.
For folks keeping $3 chickens.. no big deal, maybe..
For me, I'm heavily invested.. not just monetarily but also time, energy, generations.. worth of hard work and gathering my stock from across the country.. Losing an actual rooster by inappropriate feeding according to the LAW (even).. just isn't worth the saving of a few lousy dollars, period.
I see the difference and I attest to it.. I got no company affiliations or even preference.. Nutrients matter, if you care! Each person has their own goals, challenges, and resources. Make the best choice for you and YOUR flock with the knowledge and resources you have now. Switch it up if you learn something new, change your mind, etc. Chicken (poultry/animal) keeping has been an amazing and ever changing learning process for me that is ongoing even after 10+ years. I guess that's why I still enjoy it, chicken math is REAL and fascinating!
One thing that's especially opened my eyes since being on BYC is people's resources.. some other countries don't have available what the US does.. and formulated feed is often one of those conveniences. So I TRY to remember not to be judgmental even if I disagree with or don't fully understand someone's thoughts on a subject. I try and remember we are all doing our best and here to support each other.
Sounds like you've already received and taken the advice from this thread.. but keep up the good work, figuring out what works for you, why YOU feel how you do about certain things, and share your experiences to. Happy adventures!
Lovely eggs, Btw!