They are domestic cattle.
The History of an Ancient Breed
Long-horned, humpless domestic cattle were well established in the Nile Valley by 4000 B.C. These cattle, known as the Egyptian or Hamitic Longhorn, appear in pictographs in Egyptian pyramids. Over the next twenty centuries (2.000 years), the Egyptian Longhorn migrated with its owners from the Nile to Ethiopia, and then down to the southern reaches of Africa.
By 2000 B. C., humped cattle (Longhorn Zebu) from Pakistan and India reached Africa. When these Zebu reached the region now known as Ethiopia and Somalia, they were interbred with the Egyptian Longhorn. The admixture produced -- the Sanga -- spread to the Sudan, Uganda, Kenya, and other parts of eastern Africa, becoming the base stock of many of the indigenous African breeds. The Sanga demonstrated most of the typical Zebu characteristics, such as pendulous dewlap and sheath, upturned horns, and a neck hump of variable size. Modern descendants of the Sanga, however, vary greatly in size, conformation, and horns, due to differing selection pressures by different tribes.
Reference
Retrieved October 11, 2009 from
http://www.ansi.okstate.edu/breeds/cattle/ankolewatusi/index.htm