Which of the following breeds was NOT developed in the United States?

Simmental is the breed that was not developed in the United States. This breed originates from the Simme Valley of Switzerland and is one of the oldest and most widely distributed of the world's beef breeds. It has been part of agricultural practices in Europe for many centuries before its introduction to the United States.

In contrast, Brangus, Santa Gertrudis, and Beefmaster are all breeds that were specifically developed in the U.S. Brangus is a hybrid breed, created by crossing Angus cattle with Brahman cattle, primarily in the southern U.S. Santa Gertrudis was developed on the King Ranch in Texas, using Brahman and Shorthorn cattle to create a heat-tolerant breed suitable for the region. Beefmaster is also a hybrid breed developed in Texas, combining various breeds, including Brahman, Hereford, and Shorthorn, emphasizing traits like fertility, weight gain, and hardiness. Understanding the origins of these breeds helps emphasize the significance of breeding programs and adaptation to specific environments within livestock production.