The decade just passed will probably go down as the most challenging period in the history of beef cattle production in North America. Events which have contributed include the acceptance of performance recording programs, artificial insemination and its ever-broadening application in farm and range herds alike, national sire evaluation programs and the Exotic Boom. This latter event has probably had the greatest significance, for the importations of foreign cattle have necessitated a complete reappraisal of the traditional concepts of beef animals on this continent.
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South Dakota State University
Rahnefeld, G. W., "Productivity of Cows in Relation to Breed Cross and Environment" (1980). South Dakota Cow-Calf Field Day Proceedings, 1980. 3.