According to Rendel (1974) almost one-half of the earth's 1,200 million cattle are in the tropics; i.e., between the Tropics of Cancer and Capricorn, while sheep and goats are largely concentrated in the semi-arid zones just south and north of the two tropics. Also, he estimated that only about 15-20 percent of the earth's 600 million pigs are in the tropics. The focus is on cattle in this presentation because of the importance of cattle relative to other classes of livestock in the tropics.

K. E Gregory, J. CM Trail, R. M Koch, L. V Cundiff

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 6. Round tables, , 279–292, 1982
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