Final answer:
The primary meat producing breed currently used in the U.S. is the Angus breed, known for its high-quality, marbled beef.
Step-by-step explanation:
The primary meat producing breed currently used in the U.S. is Angus. This breed is widely known and favored for beef production due to its ability to produce marbled, high-quality meat. The Angus breed is distinguished for being naturally polled (without horns) and for its genetic capacity to produce superior beef. Moreover, cattle, including breeds like Angus, are often grazed on open lands and then placed into feedlots where they are fed a diet of corn and silage. This process continues until they reach the desired market weight and are then processed into various beef products such as hamburgers and steaks. While Angus is renowned for meat production, other breeds such as Hereford, Charolais, and Boer (which is actually more commonly associated with goat meat) also have significant roles in various aspects of agriculture, including the meat industry.