Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Papillomatous digital dermatitis and associated risk factors in US dairy herds.

Abstract

The objective of this study was to describe the incidence of papillomatous digital dermatitis in the USA (including regional and herd size patterns) and to evaluate specific herd-level management factors associated with high incidence of digital dermatitis in US dairy herds. The study design was a population-based cross-sectional survey. Dairy operations, with at least 30 cows, in 20 states which contained 79% of US dairy cows, were sampled. On participant operations, a questionnaire was given to dairy managers. Papillomatous digital dermatitis was reported in milk cows in the previous 12 months from 43.5% of the dairy herds. 78% of affected herds reported that their first cases occurred in 1993 or later. Regions of the USA with the highest percent of herds affected included the Southwest, Northwest, and Northeast. Factors associated with high (>5%) incidence of papillomatous digital dermatitis included region, herd size, type of land lactating cows accessed on a daily basis, flooring type where lactating cows walked, percent of cows born off the operation, use of a primary hoof trimmer who trimmed cows' hooves on other operations, and lack of washing of hoof-trimming equipment between cows. Papillomatous digital dermatitis has been recently reported from dairy herds across the US. This study suggests that a high percentage of herds with digital dermatitis could be prevented. Management strategies to potentially prevent or reduce incidence of digital dermatitis on dairy operations include those related to biosecurity and 'cow hoof' environmental conditions.