Objective—To determine prevalence of udder cleft
dermatitis in a dairy herd that was experiencing an
outbreak of sarcoptic mange.
Animals—1,597 Holstein cows and late-gestation
Procedure—Animals were examined for udder cleft
dermatitis and for skin lesions consistent with sarcoptic
or chorioptic mange. Skin scrapings were collected
from 56 cows and examined for ectoparasites.
The herd was revisited 1 year later, and prevalences
of udder cleft dermatitis and lesions consistent with
mange were determined in 506 cows.
Results—Of the 1,597 cattle examined, 280 (18%)
had udder cleft dermatitis, and 1,397 (87.5%) had
lesions consistent with mange. In 43 of 56 (77%)
cows, skin scrapings revealed Sarcoptes mites. Udder
cleft dermatitis was significantly more common in
older than in younger cows. In first-lactation cows,
udder cleft dermatitis was less common during the
first 4 months of lactation than in the later stages of
lactation, but udder cleft dermatitis was identified in
cows in all stages of lactation and in cows that were
not lactating. The herd was treated with eprinomectin
to control mites, and prevalence of lesions consistent
with mange 1 year later was only 2.8%. However,
prevalence of udder cleft dermatitis was still 12%.
Conclusions and Clinical Relevance—Results suggest
that cows in any stage of lactation and cows that
are not lactating can have udder cleft dermatitis but
that lesions are more common in older cows. Control
of sarcoptic mange was accompanied by a moderate
reduction in the prevalence of udder cleft dermatitis
but did not eliminate the condition. (J Am Vet Med