Thanks for replying, GC. Like you, I suspect that the sex-link breeding may have something to do with their behavior. Even so, I've known other people with these birds (different breeder), and haven't heard of any aggressive tendencies like these exhibit. As this is my first time with hybrids...
I bought six ISA Browns last spring to be my exclusive egg layers. They are extraordinary in that respect, and none has ever missed providing one egg each day since they were 14 weeks old. The problem is that they aggressively peck and bite anyone that comes into their pen. I have to wear...