A THEORETICAL COMPARISON BETWEEN DIRECT AND INDIRECT CONVERSIONS OF DAIRY BULL EVALUATIONS

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Abstract

Simulated data were used to compare direct and indirect conversions of bull evaluations in the presence of selection. In the case of indirect conversion, when bulls used to calculate conversions from the exporting to the intermediate country were first tested in the exporting country, indirect conversions resulted in unbiased predicted evaluations. When these bulls were first tested in the intermediate country and were selected on their estimated breeding value, indirect conversions overestimated predicted evaluations in the importing country. In all cases the prediction er or variance was consistently higher for indirect than for direct conversions. Indirect conversions could be used only if there are no adequate common bulls in two countries; caution should be exercised when choosing the intermediate country.

Original languageEnglish
Pages (from-to)57-65
Number of pages9
JournalJournal of Animal Breeding and Genetics
Volume110
Issue number1
DOIs
Publication statusPublished - Mar 1993

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