The first task of any investigation into the genetic potential of a population is to estimate the functional relationships which characterise that population; these are the phenotypic and genetic parameters. Estimating these parameters is largely a m atter of partitioning genetic and non-genetic variance and covariance from large scale analyses. Furthermore, as these parameters are determined by the ratios of variances and covariances, they will change through time and space, depending, for example, on selection, on the particular population and on management conditions. Nevertheless, for practical purposes, generalizations are necessary as in many instances both time and suitable data are not available for original analyses. Therefore it seems justified to assume that average values for these parameters are not far from the truth and may be used effectively in the simulation and application of different breeding programmes.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 541–563, 1974
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