Linear vs. piecewise Weibull model for genetic evaluation of sires for longevity in Simmental cattle (CROSBI ID 206982)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Raguž, Nikola ; Jovanovac, Sonja ; Mészáros, Gábor ; Sölkner, Johann
engleski
Linear vs. piecewise Weibull model for genetic evaluation of sires for longevity in Simmental cattle
This study was focused on genetic evaluation of longevity in Croatian Simmental cattle using linear and survival models. The main objective was to create a genetic model that is most appropriate to describe the longevity data. Survival analysis, using piecewise Weibull proportional hazards model, used all information on the length of productive life including censored as well as uncensored observations. Linear models considered culled animals only. The relative milk production within herd had a highest impact on cows' longevity. In comparison of estimated genetic parameters among methods, survival analysis yielded higher heritability value (0.075) than linear sire (0.037) and linear animal model (0.056). When linear models were used, genetic trend of Simmental bulls for longevity was slightly increasing over the years, unlike a decreasing trend in case of survival analysis methodology. Average reliability of bulls' breeding values was higher in case of survival analysis. The rank correlations between survival analysis and linear models bulls' breeding values for longevity were ranged between 0.44 and 0.46 implying huge differences in ranking of sires
longevity ; genetic evaluation ; linear models ; piecewise Weibull model ; Simmental cattle
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Podaci o izdanju
Povezanost rada
Poljoprivreda (agronomija)