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I don't have the expertise you are looking for but thought you might enjoy this video.
Broiler Chicken Videos
As far as traits to look for, I'll give a non-expert opinion.
Pounds of feed to pounds of meat ratio has to be high on the list.
Look for the conformation you want. Do you prefer white meat or dark?
Do you pluck or skin? If you skin it does not matter, but if you pluck you probably want a white or buff bird. You always leave pin feathers behind when you pluck. With the dark feathers they are very visible but with light feathers you don't see them. You get a prettier carcass with light feathers. If you butcher when they are molting this becomes much more important.
The last I would consider is temperment. How well do they handle confinement if you are keeping them confined. Or are there other behavioral traits you want?
The experts you want to talk to are probably not in hatcheries but are more likely in a very few Universities. The University of Arkansas is one of the top three Poultry Science research universities in the country. I can't remember the other two, one is in the northwest and I believe one is in the southeast. Tyson is really big here. They have funnelled enough money in support of Arkansas's poultry Science department to get buildings named after them and make it one of the best. A lot of the research you are looking for is performed at these universities with funding from the big chicken companies.
I don't know about roosters passing certain traits and hens passing others. I do know a rooster gives a copy of each and every gene he has (I guess it would be more accurate to say half since he gives a copy of one of the gene pair. Which one of that pair is random) The hen similarly gives a copy of each to her sons but does not give a copy of the sexlinked genes to her daughters.
I'm no expert and it is easier to see rooster traits in the father and hen traits in the mother, but I'm not sure there is as much influence based on sex as many people seem to believe. But that is just my non-expert opinion.
Good luck in your quest and again,
