Investigation of factors affecting voluntary and involuntary culling in expanding dairy herds in Wisconsin using survival analysis.

@article{Weigel2003InvestigationOF,
  title={Investigation of factors affecting voluntary and involuntary culling in expanding dairy herds in Wisconsin using survival analysis.},
  author={Kent A. Weigel and Robert W. Palmer and Daniel Z. Caraviello},
  journal={Journal of dairy science},
  year={2003},
  volume={86 4},
  pages={1482-6}
}
Trends in the relative risk of voluntary culling of low-producing cows and involuntary culling of high-producing cows were examined in 186 Wisconsin dairy herds that expanded significantly between 1994 and 1998. A Weibull model for survival analysis was applied to data of 72,456 Holstein cows with first calving from 1981 to 2000; this model included a time-independent effect of age at first calving and time-dependent effects of year-season, age-parity, and within herd-year quintile for combined… CONTINUE READING

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