Most beef that you buy is corn fed beef. Corn fed cattle tastes better because they have more marble (fat). Grass fed beef doesn't taste very well. Corn fed beef also are large methane producers, which is part of the debate of gobal warming. You can smell the big feedyards for miles.I belive cattle outnumber people in the US.

Brahman cattle tolorate heat better than Angus so thats why you see them in countries Guatemala. You see Angus, Brahama crosses in the hot sticky parts of the US while Herford Angus crosses in the north.

It's all about pounds from the feedyard to the super market although the beef industry have been breeding more efficient cattle for the last 20 years. Cattle that gain more with less feed.