Roosters don't lay eggs, and somebody did the math and figured out the return on hens vs roosters is so much better it's not even worth raising the roosters.

Roosters are raised for meat - just a different breed from those raised to lay eggs.

Not what I heard. I am led to believe the males are essentially shredded alive.

http://www.foxnews.com/food-drink/2016/06/13/us-egg-producer...

That's what Falling3 said. One species of rooster is shredded alive immediately after hatching. The other species of rooster is raised so it can be cooked and eaten.

resturant by me sells broiler chicken, guess what that means?

Has anyone done the math recently or is it industry dogma?

Capon is tasty though.

Because the traits beneficial to meat production (like growth rate, muscle development etc) are inversely correlated to the traits beneficial to egg production (feeding efficiency, eggs per year, egg size...).

Part of that is that the animal only has so much energy to spend, the other is that when breeding for one trait, one invariably tends to neglect other traits.

Broilers and Layers have very different life cycles due to selective breeding. https://www.quora.com/What-is-the-difference-between-layers-...

Females have less biological variation so fit in better with industrial farming.

Females are also more docile and less likely to cause damage to other chickens.

Broiler chickens aren't kept alive long enough to reach sexual maturity. They live for just 6 weeks, so docility due to sex really isn't a factor.