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Additive Versus Multiplicative Correction Factors for Weaning Weight in Beef Cattle

Oklahoma State University, Stillwater

Abstract

Adjusted 205-day weaning weights of 13,937 Hereford and Angus calves recorded in the Oklahoma Beef Cattle Improvement Program over a 4-year period were used in this study. A study of additive versus multiplicative adjustments was conducted for age of dam, sex, season of birth and type of management by determining which method would more nearly equalize means among subclasses and variances within subclasses. Additive corrections were found to be more appropriate than multiplicative corrections in adjusting for the effects of age of dam, season of birth and type of management. Multiplicative corrections were found to be more appropriate in adjusting for the effect of sex. In addition to more nearly equalizing variances within sexes, multiplicative corrections completely accounted for the interaction observed between sex and type of management.

¹ Present address: Department of Animal Science, University of Kentucky, Lexington.

² Department of Animal Science.