Abstract

The objective of this research was to study whether survival analysis results in a more accurate genetic evaluation for female fertility traits compared with the usual methodology based on linear models. The fertility trait studied was interval between calving and last insemination. A stochastic simulation describing the reproductive cycle of first-parity cows was done, in which true breeding values for conception rate were created. A model containing effects of sire and herd was used both with survival analysis and with mixed linear model analysis to predict sire breeding values. Correlations between true breeding values for conception rate and breeding values for calving to last insemination predicted by the best survival analysis model or the best linear model were 0.77 and 0.68, respectively. The results showed that when pregnancy status is known, survival analysis is a better method than linear models for genetic evaluation of conception rate when using observations on the interval between calving and last insemination

Published in

Journal of Dairy Science
2005, Volume: 88, number: 6, pages: 2253-2259
Publisher: AMER DAIRY SCIENCE ASSOC

SLU Authors

• Schneider, Maria Del Pilar

  • Department of Animal Biosciences, Swedish University of Agricultural Sciences
    

• Strandberg, Erling

  • Department of Animal Biosciences, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Veterinary Science
Animal and Dairy Science


Publication identifier

DOI: https://doi.org/10.3168/jds.S0022-0302(05)72901-5

Permanent link to this page (URI)

https://res.slu.se/id/publ/7454