Genetic analysis of longitudinal trajectory of clinical mastitis in first-lactation Norwegian cattle.

@article{Heringstad2003GeneticAO,
  title={Genetic analysis of longitudinal trajectory of clinical mastitis in first-lactation Norwegian cattle.},
  author={Bj\org Heringstad and Yu-mei Chang and Daniel Gianola and Gunnar Klemetsdal},
  journal={Journal of dairy science},
  year={2003},
  volume={86 8},
  pages={2676-83}
}
Clinical mastitis records for 36,178 first-lactation daughters of 245 Norwegian Cattle (NRF) sires were analyzed with a Bayesian longitudinal threshold model. For each cow, the period going from 30 d before calving to 300 d after calving was divided into 11 intervals of 30 d length each. Absence or presence of clinical mastitis within each interval was scored as "0" or "1", respectively. A Bayesian threshold model consisting of a set of explanatory variables plus Legendre polynomials on time of… CONTINUE READING

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