A mixed-effects time-to-event analysis of the relationship between first-lactation lameness and subsequent lameness in dairy cows in the UK.

@article{Hirst2002AMT,
  title={A mixed-effects time-to-event analysis of the relationship between first-lactation lameness and subsequent lameness in dairy cows in the UK.},
  author={W M Hirst and Richard Donald Murray and Wm. R. Ward and Nigel P French},
  journal={Preventive veterinary medicine},
  year={2002},
  volume={54 3},
  pages={191-201}
}
Data for 611 second-lactation and 251 third-lactation cows were examined using mixed-effects time-to-event models to determine the shape of the hazard, quantify relative risk and estimate herd- and sire-level variation in time to lameness. The semi-parametric Cox and fully parametric Weibull models were suggested from univariable Kaplan-Meier plots. Time to all-lameness, claw-horn lameness and skin lameness were modelled. Explanatory variables were season of current-lactation calving, age at… CONTINUE READING