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https://doi.org/10.15567/mljekarstvo.2014.0301

Linear vs. piecewise Weibull model for genetic evaluation of sires for longevity in Simmental cattle

Nikola Raguž ; Josip Juraj Strossmayer University of Osijek, Faculty of Agriculture, Department for Special Zootechnics, Kralja Petra Svačića 1d, 31000 Osijek, Croatia
Sonja Jovanovac ; Josip Juraj Strossmayer University of Osijek, Faculty of Agriculture, Department for Special Zootechnics, Kralja Petra Svačića 1d, 31000 Osijek, Croatia
Gábor Mészáros ; The Roslin Institute, The University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, Scotland, UK
Johann Sölkner ; University of Natural Resources and Life Sciences, Department of Sustanaible Agricultural Systems, Gregor Mendel Strasse 33, A-1180 Vienna, Austria

Puni tekst: engleski, pdf (316 KB) str. 141-149 preuzimanja: 654* citiraj
APA 6th Edition
Raguž, N., Jovanovac, S., Mészáros, G. i Sölkner, J. (2014). Linear vs. piecewise Weibull model for genetic evaluation of sires for longevity in Simmental cattle. Mljekarstvo, 64 (3), 141-149. https://doi.org/10.15567/mljekarstvo.2014.0301
MLA 8th Edition
Raguž, Nikola, et al. "Linear vs. piecewise Weibull model for genetic evaluation of sires for longevity in Simmental cattle." Mljekarstvo, vol. 64, br. 3, 2014, str. 141-149. https://doi.org/10.15567/mljekarstvo.2014.0301. Citirano 23.10.2020.
Chicago 17th Edition
Raguž, Nikola, Sonja Jovanovac, Gábor Mészáros i Johann Sölkner. "Linear vs. piecewise Weibull model for genetic evaluation of sires for longevity in Simmental cattle." Mljekarstvo 64, br. 3 (2014): 141-149. https://doi.org/10.15567/mljekarstvo.2014.0301
Harvard
Raguž, N., et al. (2014). 'Linear vs. piecewise Weibull model for genetic evaluation of sires for longevity in Simmental cattle', Mljekarstvo, 64(3), str. 141-149. https://doi.org/10.15567/mljekarstvo.2014.0301
Vancouver
Raguž N, Jovanovac S, Mészáros G, Sölkner J. Linear vs. piecewise Weibull model for genetic evaluation of sires for longevity in Simmental cattle. Mljekarstvo [Internet]. 2014 [pristupljeno 23.10.2020.];64(3):141-149. https://doi.org/10.15567/mljekarstvo.2014.0301
IEEE
N. Raguž, S. Jovanovac, G. Mészáros i J. Sölkner, "Linear vs. piecewise Weibull model for genetic evaluation of sires for longevity in Simmental cattle", Mljekarstvo, vol.64, br. 3, str. 141-149, 2014. [Online]. https://doi.org/10.15567/mljekarstvo.2014.0301

Sažetak
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.

Ključne riječi
longevity; genetic evaluation; linear models; piecewise Weibull model; Simmental cattle

Hrčak ID: 126245

URI
https://hrcak.srce.hr/126245

[hrvatski]

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