Interrelationships between production and reproductive diseases in holstein cows. Path analysis

Area of Science:

• Veterinary Medicine
• Animal Science
• Reproductive Biology

Background:

• Reproductive diseases significantly impact dairy cattle health and productivity.
• Understanding causal relationships between postpartum diseases is crucial for herd management.

Purpose of the Study:

• To investigate the causal pathways of common postpartum diseases in dairy cows.
• To quantify the effects of these diseases on reproductive and production parameters.

Main Methods:

• Path modeling was used to analyze 810 lactation records.
• Included variables: five diseases, age, milk production, days in milk, days dry, and calving interval.
• Restricted models were derived excluding dystocia and non-causal associations.

Main Results:

• Retained placenta was identified as a primary cause of metritis.
• All diseases, excluding dystocia, increased calving interval, milk production (breed class average), and days in milk.
• Cystic follicle had a direct positive effect on milk production.

Conclusions:

• Postpartum diseases have significant negative impacts on dairy cow health and productivity.
• Effective management of retained placenta is critical to prevent metritis.
• Interventions targeting these diseases can improve herd reproductive efficiency and milk yield.