What do Angus ranchers feed their cattle Do they add hormones?

Depends on the ranchers themselves and what market they are targeting, and what cattle they're feeding. Cattle fed on a feedlot diet (which comprises of 97% of the finisher/backgrounding herd in the USA) are not fed hormones, but are given growth hormones via implants in the ears. Heifers, on the other hand, are fed hormones to keep them from going into heat all the time. Angus cattle on such a diet are fed primarily corn-grain-silage mixture to fatten them up prior to slaughter.