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Presence of Mycobacterium avium subs. paratuberculosis DNA in milk used to feed calves in Portugal

Published online by Cambridge University Press:  19 May 2017

Célia Leão
Affiliation:
Instituto Nacional de Investigação Agrária e Veterinária, I.P. (INIAV, I.P.), Unidade Estratégica de Investigação e Serviços em Produção e Saúde Animal, Rua General Morais Sarmento, 1500-311 Lisboa, Portugal
Ana Botelho
Affiliation:
Instituto Nacional de Investigação Agrária e Veterinária, I.P. (INIAV, I.P.), Unidade Estratégica de Investigação e Serviços em Produção e Saúde Animal, Rua General Morais Sarmento, 1500-311 Lisboa, Portugal
Elisabete Martins
Affiliation:
InVivoNSA Portugal S. A., Zona industrial de Murtede, 3060-372 Murtede – Cantanhede, Portugal
Carla Aguiar
Affiliation:
InVivoNSA Portugal S. A., Zona industrial de Murtede, 3060-372 Murtede – Cantanhede, Portugal
Inês Rebelo
Affiliation:
Centro de Investigação Interdisciplinar em Sanidade Animal, Faculdade de Medicina Veterinária, Universidade de Lisboa, Av. Universidade Técnica, 1300-477 Lisboa, Portugal
Telmo Nunes
Affiliation:
Centro de Investigação Interdisciplinar em Sanidade Animal, Faculdade de Medicina Veterinária, Universidade de Lisboa, Av. Universidade Técnica, 1300-477 Lisboa, Portugal
Ricardo Bexiga*
Affiliation:
Centro de Investigação Interdisciplinar em Sanidade Animal, Faculdade de Medicina Veterinária, Universidade de Lisboa, Av. Universidade Técnica, 1300-477 Lisboa, Portugal
*
*For correspondence; email: ricardobexiga@fmv.ulisboa.pt

Abstract

This Technical Research communication describes results of a study aimed at detecting the presence of Map in milk fed to calves, and identifying possible risk factors for that presence. A questionnaire was performed on 37 dairy farms and waste milk samples were collected on 3 occasions separated by a minimum of 1 week. For farms not feeding waste milk, bulk tank milk samples were collected instead. A real time PCR for the detection of the IS900 sequence was performed for the detection of Map. A majority of farms (89·2%) fed waste milk, with only one pasteurising the milk before feeding it to calves. Results of the PCR showed that 51·5% of the farms that were feeding waste milk had a positive result for Map on that milk. None of the studied risk factors were significantly associated with the presence of Map in milk samples, possibly due to the small number of farms entering the study. However, the prevalence of positive samples for Map on PCR was 3·5 times higher for farms that bought in animals from a single origin and 1·9 times higher for farms that bought from multiple farms, when compared with closed farms. Having a calving area for multiple cows also increased the risk of a positive Map result by 1·5 when compared with single pens. The risk of having a positive Map result on waste milk was 1·6 times higher for farms feeding that milk to male calves and 1·4 for farms feeding to both male and female calves, when compared with farms not feeding waste milk. This study highlights paratuberculosis as one of the potential risks of feeding waste milk to calves, and the need for mitigation strategies to be in place to avoid unnecessary disease transmission.

Type
Research Article
Copyright
Copyright © Proprietors of Journal of Dairy Research 2017 

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