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Genetic Improvement of Beef Cattle in the United States: Cattle, People and Their Interaction^1,2,

Iowa State University, Ames 50011

Abstract

The purpose of this essay is to develop a historic perspective of the beef cattle population and the legion of people directing its genetic change so that future leadership can increase the rate of breeding technology assimilation. Use of cattle for beef to feed millions is relatively recent. The beef industry of the United States has a rich, romantic heritage that combined Spanish exploitation with British tradition. Spanish cattle became adapted as the Texas longhorn and the European cattle became indigenous. Breeds developed in Britain replaced both. The zebu was introduced to produce cattle adapted to the gulf Coast. Selection for early maturity in the British breeds promoted by livestock shows was ended by the dwarf gene. The Charolais breed demonstrated growth potential. then in 1967, Continental European breeds were imported, giving an array of biological types from which to select. Beef cattle breeding research expanded after the second world war through the three regional projects. Performance Registry International was the focal point for performance. The Beef Improvement Federation produced guidelines for recording beef performance including those for national sire evaluation. U.S. Meat Animal Research Center evaluated the several newly introduced breeds. To date, breeding researchers have developed breeding technology for use by the breeder. The major breed associations are keeping and utilizing performance records. The genetic structure of the beef breeds is being altered by the use of AI such that genetic change can be made rapidly by the use of superior sires evaluated on their progeny in many herds

¹ Journal Paper No. J-10167 of the Iowa Agr. and Home Econ. Sta., Ames. Project No. 2000.

² This paper was awarded first place in the Rouse Essay Contest on genetic improvement of beef cattle in the United States. The contest, sponsored by the American Society of Animal Science, was funded by the Rouse Angus Corporation, a nonprofit and tax exempt foundation, formed to encourage research and teaching activities in conjunction with the One Bar Eleven Ranch, Saratoga, WY.