I agree it seems hatchery NN in the past were bigger and laid larger eggs than the current crop.
My very first NN was a hen from McMurray, she was extremely heavy and could not close egg cartons over her eggs. Thought that was normal for hatchery NN so I did not get any more until over a decade later and was surprised.. Sure wish that hen was bred to keep her type and production ongoing.
The summers in my location goes into the 110-120F range. It gets so hot the ground becomes painful to the touch- the free range birds would run/jump/flap from shade to shade. The NN do very well through the summers. The lighter weight breeds such as leghorns can do well, but for dual purpose, it just seems sensible to go with NN.
You could even breed NN into a breed you might favor otherwise but heat tolerance was of concern. NN Marans would be pretty straightfoward to breed for- cross once, then breed a NN bird from each generation back to pure Marans. I've done that kind of breeding and did notice an improvement in heat tolerance.
I believe the NN French birds are mainly free range broilers.. one feature was having excellent skin for crisping...? Also many broiler studies measured larger meat weight in NN compared to non NN in broiler crosses/mixes. That's so interesting...
My very first NN was a hen from McMurray, she was extremely heavy and could not close egg cartons over her eggs. Thought that was normal for hatchery NN so I did not get any more until over a decade later and was surprised.. Sure wish that hen was bred to keep her type and production ongoing.
The summers in my location goes into the 110-120F range. It gets so hot the ground becomes painful to the touch- the free range birds would run/jump/flap from shade to shade. The NN do very well through the summers. The lighter weight breeds such as leghorns can do well, but for dual purpose, it just seems sensible to go with NN.
You could even breed NN into a breed you might favor otherwise but heat tolerance was of concern. NN Marans would be pretty straightfoward to breed for- cross once, then breed a NN bird from each generation back to pure Marans. I've done that kind of breeding and did notice an improvement in heat tolerance.
I believe the NN French birds are mainly free range broilers.. one feature was having excellent skin for crisping...? Also many broiler studies measured larger meat weight in NN compared to non NN in broiler crosses/mixes. That's so interesting...

e hen is so cute I just started reading the N/N forum. She looks silver lace wyandotte/NN. I am crossing my one and only NN hen with my Brahmas have 7 babies . Now growing Think I got a lot of rooster want hens. A 2 legged predator stoled my pen of 10 pullets a month . Putting a lock on the pen.ago