A NOTE ON THE USE OF INBREEDING IN PROGENY TEST SCHEMES

In this note some theoretical and simulated results are presented comp aring the selection response in a progeny test scheme that utilizes in bred offspring for testing, with respect to a standard progeny test. T he theory indicates a substantial increase in selection response, alth ough the advantage decreases as the number of dams mated to a sire and the number of offspring per dam increases. The advantage is at a maxi mum when the variation of the trait is due to segregation of recessive alleles at low frequencies unfavourable to the direction of selection . Computer simulation confirmed the advantage of the method.