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CALCULATING INBREEDING AND CUMULATIVE SELECTION DIFFERENTIALS IN THE GROOTFONTEIN MERINO STUD

G.J. Delport, J.J. Olivier & G.J. Erasmus

The algorithm presented by Quaas (1976) to calculate the inverse of a large numerator relationship matrix automatically supplies inbreeding coefficients. Far less processing time is used than with conventional methods and far bigger data sets can be handled. The method is illustrated on four generations of the Grootfontein Merino Stud. Inbreeding varied from 0 to 25 percent. The same principle, using the same sort of programme is used to calculate cumulative selection differentials. This method is shown to be simple but very effective and makes provision for unequal number of progeny and over lapping generations.

 

Published

SASAP Congress 1986