Interrelationships between production and reproductive diseases in Holstein cows. Data

Area of Science:

• Veterinary Epidemiology
• Dairy Cattle Health
• Reproductive Diseases in Cattle

Background:

• Reproductive and metabolic diseases significantly impact dairy herd productivity and welfare.
• Understanding disease prevalence and co-occurrence is crucial for effective herd management.
• Holstein cows are a key breed in commercial dairy operations, making their health data highly relevant.

Purpose of the Study:

• To investigate the epidemiology of common postpartum diseases in Holstein cows.
• To determine the prevalence rates of dystocia, retained placenta, metritis, cystic follicle, and luteal cyst.
• To explore the co-occurrence patterns of these diseases within lactations.

Main Methods:

• Retrospective analysis of 2960 lactation records from 1401 Holstein cows across 20 commercial herds.
• Utilized data from the Canadian Record of Performance and the Ontario Veterinary College herd health program.
• Calculated disease incidence rates per lactation and analyzed disease co-occurrence.

Main Results:

• Disease incidence rates per lactation were: dystocia (5.0%), retained placenta (7.1%), metritis (13.8%), cystic follicle (12.9%), and luteal cyst (3.2%).
• Production variables included average age (4.6 yr) and calving interval (417.6 days).
• Diseases were observed to occur concurrently more frequently than expected by chance.

Conclusions:

• Metritis and cystic follicle are prevalent postpartum diseases in Holstein cows.
• The co-occurrence of these diseases suggests complex underlying causes or shared risk factors.
• Findings highlight the need for integrated management strategies to address multiple disease occurrences in dairy herds.