Abstract
In order to get information on disease incidences in German Simmental, health data were collected from 104 Simmental farms in Upper Bavaria from 1987 to 1990. Generalised linear models with complementary log-log link-function and binomial errors were used for statistical analysis, taking censoring into account. Age was revealed to be of major impact on incidence rates. Age-specific risks for ten different diseases are derived for later use in economic modelling as well as average risks per calving interval and per cow and year. When averaged over all age classes, incidences per cow and year were highest for clinical mastitis (14.6%), retained placenta (8%), metritis (10.8%) and various ovulatory disorders (25.5%). Incidences of claw disorders (7.4%) and other leg problems (5%) were similar to the incidence of milk fever (6.7%).
| Original language | English |
|---|---|
| Pages (from-to) | 87-96 |
| Number of pages | 10 |
| Journal | Livestock Production Science |
| Volume | 52 |
| Issue number | 1 |
| DOIs | |
| State | Published - 15 Nov 1997 |
Keywords
- Dairy cattle
- Generalised linear models
- Health traits
- Markov process
- Survival analysis