Czech J. Anim. Sci., 2014, 59(2):54-60 | DOI: 10.17221/7229-CJAS

Estimation of breeding values for functional productive life in the Slovak Holstein populationOriginal Paper

E. Strapáková1, P. Strapák2, J. Candrák1
1 Department of Genetics and Breeding Biology, Faculty of Agrobiology and Food Resources, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
2 Department of Animal Husbandry, Faculty of Agrobiology and Food Resources, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic

Genetic evaluation of length of functional productive life was carried out using a Weibull proportional hazard sire-maternal grandsire model. The database included 405 624 Holstein cows with 19.24% censoring. The analyzed effects were parity × stage of lactation, within-herd standard deviations of milk production, herd × year × season interaction, change of herd size with respect to the previous year, age at first calving, and sire and maternal-grandsire effects. Parity × stage of lactation had the most important influence on functional productive life. The results of the analysis confirmed more intensive selection at the beginning of each lactation, whereby the risk ratio increased with each other lactation. Heritability of functional productive life was 0.13 on the original scale. Breeding values of sires were expressed as relative breeding values with a mean of 100 and genetic standard deviation of 12.

Keywords: cattle; longevity; survival analysis; risk ratio

Published: February 28, 2014  Show citation

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Strapáková E, Strapák P, Candrák J. Estimation of breeding values for functional productive life in the Slovak Holstein population. Czech J. Anim. Sci. 2014;59(2):54-60. doi: 10.17221/7229-CJAS.
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