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Selection Indexes for Weanling Traits in Beef Calves^1,2,

Virginia Agricultural Experiment Station, Blacksburg and and United States Department of Agriculture

Abstract

Eight selection indexes for weanling beef calves were developed and compared. These were based on daily gain from birth to weaning, 203-day weight, and type score.

Selection on the basis of an index combining daily gain and type or weaning weight and type in the best linear equation was concluded to be preferable to selecting on the basis of either growth or type singly.

Estimates of heritabilities, genetic and phenotypic correlations, and economic values were calculated.

¹ Adapted from a thesis submitted by the senior author to the Virginia Polytechnic Institute as partial fulfillment of the requirements for the degree of Master of Science.

² Contribution to Southern Regional Beef Cattle Breeding Project S-10.

³ Present address: Department of Animal Industry, North Carolina State College, Raleigh, N. C.

⁴ Beef Cattle Research Branch, Animal Husbandry Research Division, ARS, U.S.D.A., Knoxville, Tennessee.