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Path analysis for seven postpartum disorders of Holstein cows
M T Correa1, H Erb, J Scarlett
1Cornell University, Ithaca, NY 14853.
Journal of Dairy Science
|May 1, 1993
Summary
Stillbirth and calving difficulties significantly increase the risk of postpartum diseases in dairy cows, including metritis and retained placenta. Calf sex and twinning also influence the likelihood of certain clinical disorders.
Area of Science:
- Veterinary Medicine
- Animal Science
- Reproductive Biology
Background:
- Postpartum clinical disorders are a major concern in dairy herds.
- Understanding risk factors is crucial for herd health management.
Purpose of the Study:
- To model seven common postpartum clinical disorders in dairy cows.
- To identify factors related to the calf and parity that influence these disorders.
Main Methods:
- Path analysis and multiple logistic regression were employed.
- An extrabinomial variation error term was used to account for herd effects.
- Data comprised 7761 lactation records from 34 commercial dairy herds.
Main Results:
- Stillbirth increased the odds of metritis and retained placenta.
- Female calves were associated with lower odds of dystocia and mastitis.
- Twinning increased the odds of dystocia and retained placenta.
- Dystocia, milk fever, and ketosis were linked to increased odds of left-displaced abomasum and metritis.
Conclusions:
- Calf-related factors and calving events significantly impact postpartum health in dairy cows.
- Specific disorders are interconnected, highlighting the need for a holistic approach to disease prevention.
- Parity interactions were noted for stillbirth and ketosis-related conditions.