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Comparison between methods for estimation of breeding values for longevity in Slovenian Holstein population
Potočnik, Klemen ...
Longevity of herd life is a highly desirable trait that has a great impact on economy of dairy production. Herd life can be measured in several ways, as survival in defined age or in days from first ...calving to culling. Breeding values (EBV) used for selection can be estimated for direct herd life (DHL) or indirect herd life (IHL). For Slovene Holstein population we compared different models for DHL: the proportional hazards (PH) model, multi trait sire (SM) models and multi trait animal (AM) models (for the last two dependent variables was defined as survival in particular period or days from first calving to culling). We estimated genetic parameters, correlations between various EBVs for DHL ans correlations between DHL EBVs and EBVs for other traits in routine genetic evaluation. Heritability estimated using the PH was 0.179, for AM and SM between 0.08-0.19 and 0.05-0.17, respectively. Correlation coefficients between AM and SM EBVs were 0.70-0.88. Estimated correlation coefficients between EBVs for DHL using the PH and EBV of other traits are relatively low, as expected: milk yield (-0.44), somatic cell count(0.21), rear teat position (-0.25), rear teat placement (-0.21), front teat pleacement (0.20) and muscling (0.22). Due too the low correlation between DHL EBVs from PH and MT models, correlations between various trait and all five DHL EBVs are EBVs are similar.
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