Bos indicus
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Bos indicus (also referred to as Zebu-type) are humped cattle from South Central Asia that are well suited to tropical and sub-tropical environments, including the stresses like heat, humidity, parasites, and poorly digestible forage. Environmental adaptability and hybrid vigor of cattle with some Zebu-type lineage are particularly significant in the South and Southwest. Some examples of Bos indicus type cattle in the U.S. are the Brahman, Brangus, and Beefmaster breeds which were developed here and are often referred to as American breeds. Several of them are composite breeds, developed by crossing two or more other breeds.

According to the USDA, “cattle of mostly Bos indicus breed ancestry are more likely than their Bos taurus counterparts to produce tough beef.” USDA physiologist Mohammad Koohmaraie cautions against using only the ancestry as a gauge of tenderness because "Beef tenderness or toughness, is controlled about 70% by environment and 30% by heredity and may involve the expression of many genes." Source USDA Towards More Tender Beef.
 

Varieties

The following are Bos indicus breeds that are commonly found in the United States:

Brahman, Brangus, Beefmaster, Santa Gertrudis, Simbrah. (See Beef Cattle Breeds for more information on the individual breeds.)

Information on the Bos Indicus was researched from work posted by Texas A&M University.