Cow longevity measured in years of production affects efficiency by altering the proportion of cows in production. Assuming constant cow numbers, removing cows from the herd at younger ages for standard culling criteria results in higher replacement rates and a smaller proportion of the herd in production. This paper compares longevity of Angus, Charolais and reciprocal cross cows under drylot and pasture management systems. Age at removal and reason for removal were evaluated.
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South Dakota State University
Anderson, Vernon L., "Longevity of Crossbred VS Straightbred Beef Cows" (1980). South Dakota Cow-Calf Field Day Proceedings, 1980. 9.