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Genetic evaluation of ovulatory disorders in Austrian Fleckvieh cows: a comparison between linear models and survival analysis

Published online by Cambridge University Press:  22 July 2011

A. Koeck ,
B. Fuerst-Waltl ,
J. Sölkner ,
C. Egger-Danner  and
G. Mészáros
A. Koeck*
Affiliation:
Division of Livestock Sciences, Department of Sustainable Agricultural Systems, University of Natural Resources and Life Sciences, Gregor-Mendel-Street 33, 1180 Vienna, Austria
B. Fuerst-Waltl
Affiliation:
Division of Livestock Sciences, Department of Sustainable Agricultural Systems, University of Natural Resources and Life Sciences, Gregor-Mendel-Street 33, 1180 Vienna, Austria
J. Sölkner
Affiliation:
Division of Livestock Sciences, Department of Sustainable Agricultural Systems, University of Natural Resources and Life Sciences, Gregor-Mendel-Street 33, 1180 Vienna, Austria
C. Egger-Danner
Affiliation:
ZuchtData EDV-Dienstleistungen GmbH, Dresdner Street 89/19, 1200 Vienna, Austria
G. Mészáros
Affiliation:
Division of Livestock Sciences, Department of Sustainable Agricultural Systems, University of Natural Resources and Life Sciences, Gregor-Mendel-Street 33, 1180 Vienna, Austria
*
†E-mail: astrid.koeck@boku.ac.at
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Abstract

The objective of this study was to compare linear models and survival analysis for genetic evaluation of ovulatory disorders, which included veterinary treatments of silent heat/anestrus and cystic ovaries. Data of 23 450 daughters of 274 Austrian Fleckvieh sires were analyzed. For linear model analyses, ovulatory disorders were defined as a binary response (presence or absence) in the time periods from calving to 150 days after calving and from calving to 300 days after calving. For survival analysis, ovulatory disorders were defined either as the number of days from calving to the day of the first treatment for an ovulatory disorder (uncensored record) or from calving to the day of culling, or the last day of the period under investigation (until 150 or 300 days after calving; censored record). Estimates of heritability were very similar (0.016 to 0.020) across methods and periods. Correlations between sire estimated breeding value from linear model and survival analysis were 0.98, whereas correlations between different time periods were somewhat lower (0.95 and 0.96). The results showed that the length of time period had a larger effect on genetic evaluation than methodology.

Keywords

ovulatory disorderlinear modelsurvival analysisdairy cattle
Type
Full Paper
Information
animal , Volume 5 , Issue 12 , 10 November 2011 , pp. 1898 - 1902
Copyright
Copyright © The Animal Consortium 2011

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