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Papillomatous digital dermatitis in 458 dairies
A Rodríguez-Lainz1, D W Hird, R L Walker
1Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis 95616-8745, USA.
Journal of the American Veterinary Medical Association
|October 15, 1996
Summary
Papillomatous digital dermatitis (PDD) was common in California dairies in 1993, particularly in southern and central regions. Most dairy managers first observed this condition in 1992 or 1993.
Area of Science:
- Veterinary epidemiology
- Bovine health
- Dairy cattle management
Background:
- Papillomatous digital dermatitis (PDD) is a significant concern in dairy cattle.
- Understanding the prevalence and patterns of PDD is crucial for effective disease control.
Purpose of the Study:
- To estimate the prevalence of PDD in California dairies in 1993.
- To describe temporal and spatial PDD patterns and treatment responses.
- To identify herd-related risk factors for PDD.
Main Methods:
- An epidemiologic survey was conducted.
- Data were collected via mailed questionnaires sent to 1,429 dairies across California.
- A 50% random sample of dairies outside Southern California was included.
Main Results:
- PDD prevalence was higher in Southern (75.3%) and Central (68.8%) regions compared to North Coast (33.3%) and North (23.1%) regions.
- Affected herds reported a mean of 11.6% of cows with PDD.
- Most managers (74%) first noticed PDD in 1992 or 1993, with seasonal activity varying by region.
Conclusions:
- PDD was widespread in California dairies in 1993.
- Prevalence was notably higher in southern and central regions.
- The study highlights the need for regionalized PDD management strategies.