J. Anim Sci.
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J. Anim Sci. 1960. 19:134-139.
© 1960 American Society of Animal Science
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Selection Indexes for Weanling Traits in Spring Lambs1

C. S. Givens, Jr.2, R. C. Carter and J. A. Gaines

Virginia Agricultural Experiment Station, Blacksburg

Abstract

Five selection indexes for early milk-fat spring lambs were developed and compared. These were based on the weanling traits, daily gain from birth to weaning or slaughter, 120-day weight, and live market grade. Selection on daily gain alone seems most practical because it is easiest to use and should give near maximum genetic returns in economic terms. Estimates of heritabilities, genetic and phenotypic correlations, and economic values were calculated.

Footnotes

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

2 Present address: Hales and Hunter Company, Wilmington, Delaware.






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Copyright © 1960 by the American Society of Animal Science.