Statistical analysis of length of productive life for dairy cows of the Normande breed.

@article{Ducrocq1994StatisticalAO,
  title={Statistical analysis of length of productive life for dairy cows of the Normande breed.},
  author={V. Ducrocq},
  journal={Journal of dairy science},
  year={1994},
  volume={77 3},
  pages={
          855-66
        }
}
The length of productive life of 103,214 Normande cows milked from 1979 to 1989 in purebred herds was analyzed using a mixed Weibull model: their probability of being culled, or hazard function, was supposed to be the product of a baseline Weibull hazard function and explanatory variables that were log-linear and time-dependent. Fixed effects that may have an impact on culling rate were successively added to the model. Two random effects, a herd-year and a sire effect, were also included. The… CONTINUE READING
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