I think you are referring to leghorns?
Leghorns, both brown & white, will return to the roost at night. The only time I've ever chickens not return to the roost at night are pullets when I'm training them to return to the coop, and sometimes when I'm integrating flocks and some chickens start...
I am asking this very same question.
If anyone has a link to a publication that scientifically compares the various poultry breeds as to their foraging skills and production abilities...Please post it or PM me a link.
Thank you.