Semen as a source of Mycoplasma bovis mastitis in dairy herds

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Haapala , V , Pohjanvirta , T , Vähänikkilä , N , Halkilahti , J , Simonen , H , Pelkonen , S , Soveri , T , Simojoki , H & Autio , T 2018 , ' Semen as a source of Mycoplasma bovis mastitis in dairy herds ' , Veterinary Microbiology , vol. 216 , pp. 60-66 . https://doi.org/10.1016/j.vetmic.2018.02.005

Title: Semen as a source of Mycoplasma bovis mastitis in dairy herds
Author: Haapala, Vera; Pohjanvirta, Tarja; Vähänikkilä, Nella; Halkilahti, Jani; Simonen, Henri; Pelkonen, Sinikka; Soveri, Timo; Simojoki, Heli; Autio, Tiina
Contributor: University of Helsinki, Production Animal Medicine
University of Helsinki, Finnish Food Safety Authority (EVIRA)
University of Helsinki, Production Animal Medicine
University of Helsinki, Production Animal Medicine
University of Helsinki, Finnish Food Safety Authority (EVIRA)
Date: 2018-03
Language: eng
Number of pages: 7
Belongs to series: Veterinary Microbiology
ISSN: 0378-1135
URI: http://hdl.handle.net/10138/234195
Abstract: Mycoplasma bovis infections are responsible for substantial economic losses in the cattle industry, have significant welfare effects and increase antibiotic use. The pathogen is often introduced into naive herds through healthy carrier animals. In countries with a low prevalence of M. bovis, transmission from less common sources can be better explored as the pathogen has limited circulation compared to high prevalence populations. In this study, we describe how M. bovis was introduced into two closed and adequately biosecure dairy herds through the use of contaminated semen during artificial insemination (AI), leading to mastitis outbreak in both herds. Epidemiological analysis did not reveal an infection source other than semen. In both farms the primary clinical cases were M. bovis mastitis in cows inseminated with the semen of the same bull four weeks before the onset of the disease. One semen straw derived from the semen tank on the farm and other semen lots of this bull were positive for M. bovis. In contrast, semen samples were negative from other bulls that had been used for insemination in previous or later oestrus to those cows with M. bovis mastitis. Furthermore, cgMLST of M. bovis isolates supported the epidemiological results. To our knowledge this is the first study describing the introduction of M. bovis infection into a naive dairy herd via processed semen. The antibiotics used in semen extenders should be re-evaluated in order to provide farms with M. bovis-free semen or tested M. bovis-free semen should be available.
Subject: Bovine semen
Dairy herd
Insemination
cgMLST
ANTIMICROBIAL SUSCEPTIBILITY
VEAL CALVES
CATTLE
FERTILIZATION
INFECTIONS
DISEASE
BULLS
413 Veterinary science
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