Threshold (TM) and linear (LM) models have been compared in a data set of 10760 birth records from 89 AI charolais sires progeny tested for direct effects on dystocia. Two variables were defined: a calving score with 4 categories and dystocia (score 1-2 vs 3-4). Heritability under TM were higher than under LM and heritability of dystocia (.263) was higher than calving score (.089). In this progeny-testing program BLUP reaches comparable efficiency as TM evaluation to rank sires. However in , reduced files superiority of TM becomes more evident.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 465–467, 1990
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