Is there any benefit when feeding only hens to use All Flock over Layer? I've been feeding
Nautre's Best layer from Tractor Supply. I keep oyster shells available but they never eat them.
YES.
But that's not the answer you want.
Layer was formulated to, in theory, be the least expensive feed one could offer commercial layer breeds, in their prime productive period, raised under commercial management, below which losses in egg size, frewquency, condition (and losses in increased bird mortality) exceed the value of the savings in using the inexpensive feed mix.
If you don't have commercial layers, the high calcium content of layer builds over time, a condition called calcium toxicity, which contributes to poor health and eventual death, with a host of problems along the way - gout, intestinal tract issues, the like. This is particularly the case with breeds that lay infrequently, and lay small to medium eggs. as well as pullets before onset of lay, birds in molt, older birds whose egg laying has slowed considerably.
All Flock's higher protein content results, statistically in larger eggs and more frequent egg laying. BUT those differences are quite small. Typically 2-3% larger eggs (1-2g) and 2-3% greater frequency (which, even for a first year golden comet is likely only 5-8 eggs over 12 months). Higher protein also contributes to faster, less stressful molts, and better bird condition overall - a factor in disease, pest, weather resistance. But once again, those differences are quite small.
For people who keep their birds as pets, there is a strong suggestion in the literature that it contributes generally to longer lives (improved body condition, better stress response over their lives), but of course that's not well studied, being of no commercial value.
Increasing protein also has declining benefit. While going from 16% to 18 or 20% has a reliably recorded 2-3% benefit across a host of measures, going from 20% to say, 24% protein is usually *much* more expensive than the increase from 16 to 20, and the benefits are even less, around 1%+.
I personally feed my birds 24%. For the first 8 weeks of their lives - their most critical growth stage, then they join the main flock at 18-20%, depending on cost. But I eat my cuilled males, they are dual purpose mutts, so the additional early weight gain benefits my table, and helps me select future breeders from needed culls at earlier age - ultimately saving me money in not needing to feed birds to week 20, 22, 24 when I can make selections and culls at week 16 or 18.