AHH, so the browns are a 3rd generation. This is a new thing. I was planning to find a white Plymouth Rock rooster in the summer, but I guess I will stick to my RIR over white Leghorn. And I am planning to put my RIR rooster with these ISA/Loghman browns to see what happens. Thank you for the information, really interesting.
Thank you, I am used to SZ, standard size
Are your dog's coping well with the chicken? You can train them to live together. I gave up veggies because of the chicken.
Black hybrids, do you mean Harco/Super Harco?