The usual method employed in progeny testing of dairy sires is to test the sire in question on the dams of the same breed. This, in other words, means that the offspring of the sire in question will be purebreds. This, of course, has resulted in a loss of material which otherwise should be used. Some countries embark on intensive crossbreeding in an attemp to uppgrade their own breed’s while others do cross at times to exploit non-additive effects. The results of such crosses are not used in progeny testing of sires. An attempt is made at progeny testing using crossbreds and comparing the results with progeny testing based on purebreds.

N. I Dim

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 3, Madrid, Spain, 667–670, 1974
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