I think it has a lot to do with the individual bird and their temperment, and I don't think it hurts to handle them as much as possible. My two best roosters were a Silver Dorking, lost him to a fox last year, and currently a huge, 1 yo, 10 lb Blue Orpington. Both boys were handled as much as I possibly could from the get go because I didn't want aggressive roos. I knew the Orp would be huge and would have the potential do some serious damage. He was 6-8 wks old when I picked him up last summer and he rode the entire 3hr trip home asleep in my lap. I've babied that roo so much my husband just shakes his head and calls him a marshmallow, and he is. He's a momma's boy.
But, he lets our neighbor's 8 yo daughter carry him all over the place when she comes over and he's perfectly content to let me hold him and will go to sleep in my lap.
