J. Anim Sci.
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J. Anim Sci. 1971. 32:1078-1083.
© 1971 American Society of Animal Science
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Evaluation of Two Types of Age of Dam Correction Factors for Weaning Weight in Beef Cattle1

Ricardo Cardellino2 and R. R. Frahm

Oklahoma State University, Stillwater 74074

Abstract

THE effectiveness of selection is increased when non-genetic sources of variation among the individuals in the population are reduced. A major non-genetic factor affecting weaning weights of beef calves is the age of the dam. As long as dams of different ages are present in the cow herd, one method available to the breeder for reducing the age of dam effect on weaning weights is the use of appropriate correction factors.

When sufficient data are available, the best correction factors are those developed from a statistical analysis of the records of the herd in which they will be used. For the purpose of this study, these are referred to as herd correction factors and are designated HCF. In1965, the U. S. Beef Cattle Records Committee recommended a set of multiplicative adjustments for age of dam to be used in general by the beef cattle industry. These are referred to as industry correction factors and designated ICF.

Footnotes

1 Journal Article 2108 of the Oklahoma Agricultural Experiment Station, Stillwater. Research conducted by the Department of Animal Sciences and Industry in cooperation with the Animal Science Research Division, A.R.S., U.S.D.A. at the Ft. Reno Livestock Research Station, El Reno, as a part of Regional Project NC-1, Improvement of Beef Cattle Through Breeding Methods.

2 Present address: Department of Genetics, North Carolina State University, Raleigh.






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Copyright © 1971 by the American Society of Animal Science.