When data are available on two successive generations, genetic parameters can be estimated from parent-offspring and sib-sib relationships. The question of combining these estimates into single values has been dealt with by HILL and NICHOLAS (1974) and GIANOLA (1979). The first authors restricted themseli/es to the estimation of heritability for a single character, whereas the latter one considered a more general situation where different traits are measured in the two generations. In this paper, a combined estimation method for genetic correlations between two sets of quantitative characters is presented, along the lines suggested by GIANOLA (1979).The situation considered here is one in which one set of traits, called X, is measured on parents and offspring, whereas the second set, called Y, is measured only in the offspring. It is supposed that X and Y cannot be measured on the same individual, either because they are characters expressed in different sexes (or different environments), or because Y can only be measured post mortem. This is the case in the pig example which will serve to illustrate the method : X represents performance-test traits whose genetic correlations with progeny-test traits Y are required in order to set up an effective selection scheme.

L. Ollivier

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 250–255, 1982
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