Originally Posted by rebelcowboysnb
I read a study here while back that said big eggs had healthier chicks all the way to adulthood. When compared to small eggs.
I sort of agree with this. I've hatched from larger eggs (9 month old pullets and older) and the little pullet eggs (20 week old pullets). I know I have not done this often enough for this to be scientifically proven and the conditions were different for each hatch, but I found the hatch rate was about the same for both. I found the chick mortality rate was quite a bit higher from the small pullet eggs. That means several chicks from the small pullet eggs died before they were 24 hours old while the chicks from the larger eggs did not die at anywhere near the same rate. When they hatched, the chicks from the small eggs were smaller than the chicks from the larger eggs. That makes sense because there are not as many nutrients in the small eggs for the chicks to grow as much during incubation. The genetics were about the same for each batch of chicks, but I'm not sure the smaller chicks will ever catch up in size with the larger chicks. Mine are not that old yet.
The ones that did make it past the 24-hour barrier appear to be as active and healthy as the chicks from the larger chicks were, but I am not convinced they will grow out as big at the end of the day.
You will read posts from people on here that have had success with the smaller eggs. I personally will not be trying that again.