ABSTRACT
Objective
Bovine anaplasmosis, caused by the hemobacteria Anaplasma marginale (Am) is the most prevalent tick-transmitted disease of cattle worldwide and is associated
with significant production losses in cattle. The objective of this survey was to
investigate the within-herd seroprevalence of antibodies to Am and the relationship between disease status and milk production after anaplasmosis
outbreak in a northern Iowa dairy herd.
Materials and Methods
In 2010 anaplasmosis was diagnosed in an Iowa dairy herd composed of 680 lactating
Holstein cows. Samples for serological testing by competitive ELISA were gathered
from 799 animals throughout 2011 in 24 separate accessions. Information on milk production,
obtained from the DHIA, was gathered from 2010 to 2013. Monthly DHIA milk production
was then statistically compared with 2011 anaplasmosis serostatus.
Results and Discussion
Analysis of competitive ELISA data found that 38% of the animals tested positive for
bovine anaplasmosis. The DHIA milk data showed seropositive cows produced significantly
less milk during 2012 (P = 0.0041) and 2013 (P = 0.0351) than did seronegative animals. This resulted in a mean (±SEM) difference
of 1,677 ± 579 kg and 2,175 ± 1,022 kg of milk per cow during 2012 and 2013, respectively.
Implications and Applications
Cows found to be seropositive for Am antibodies produced significantly less milk in subsequent lactations than seronegative
cows. Therefore, subclinical anaplasmosis may represent a potential loss of income
for dairy producers. Results also suggest that animals should not be assumed free
of infection based on geographic location.
Key words
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Article info
Publication history
Accepted:
January 15,
2021
Received:
October 14,
2020
Footnotes
One author has served as a consultant for Merck Animal Health, Bayer Animal Health, Boehringer-Ingelheim Vetmedica, Zoetis Animal Health, and Norbrook Laboratories Ltd. The other author declares no conflicts of interest.
Identification
Copyright
© 2021 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
