J. Anim Sci.
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J. Anim Sci. 1971. 32:185-190.
© 1971 American Society of Animal Science
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Genetic Analysis of a Swine Control Population. II. Estimates of Population Parameters1

Ronnie L. Edwards2 and I. T. Omtvedt

Oklahoma Agriculture Experiment Station, Stillwater 74074

Abstract

ALTHOUGH numerous estimates of heritability and phenotypic correlations are available for most traits in swine, estimates of genetic correlations are somewhat limited. Most of the estimates available have been obtained as a by-product from experimental populations established for various types of selection studies. Since these estimates of population parameters are functions of the variance distributions existing in that particular population at the time they were obtained, their usefulness in a breeding program necessitates extrapolation to other populations.

The purpose of this study was to estimate genetic parameters using a zero-selection control population that remained relatively stable during the period of investigation.

Experimental Procedure

The data for this study included records on 353 litters (3,760 pigs) farrowed from 1962 to 1968 in a closed control population in the Oklahoma swine breeding project described by Edwards, Omtvedt and Whatley (1971). Pigs were raised in confinement from birth to market at 90.7 kg and the average population inbreeding was less than 2%.

Footnotes

1 Approved as Journal Manuscript No. 1959 of the Oklahoma Agricultural Experiment Station. Project 808 in cooperation with Regional Swine Breeding Laboratory, U.S.D.A., A.R.S. A.S.R.D.

2 Present address: Extension Swine Specialist, Bowling Green, Kentucky.






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Copyright © 1971 by the American Society of Animal Science.