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Genetic Parameters of German Landrace Pigs Estimated from Different Relationships

Max-Planck-Institut für Tierzucht und Tierernährung, Mariensee, West Germany

Abstract

Estimates of genetic parameters vary considerably for most economie traits in farm animals which have been investigated extensively. Although several surveys have demonstrated that the published results vary less than expected considering the sampling distributions, the total range of available estimates likely includes some differences not adequately explained by the sampling variance. Two major reasons can cause these differences: (1) The source populations may differ in their genetic composition or may be tested under different conditions and (2) computational methods may bias the estimates in different ways. In this study, estimates of genetic parameters from hierarchal analyses of variance and covariance are compared with those from correlations between the progeny tests of sons and daughters and the progeny tests of their parents.

Materials and Methods

The data for this study came from 12 pig testing stations in West Germany. These have a total capacity of approximately 4,000 groups (2 barrows and 2 gilts) per year.

¹ Geneticist, Heisdorf & Nelson Farms; present address: 219 Cuxhaven, Am Seedeich 9, W. Germany.

I would like to thank Dr. J. L. Lush and the referees for their helpful comments during the preparation of the manuscript.