DAIRY farmers across Scotland are being urged to take part in a new study to help scientists better understand the spread of the Mycoplasma bovis bacterium in cattle.
Mycoplasmas are nature's smallest living cell, and do not contain any cell wall, making them resistant to penicillin and other antibiotics. Calves infected with Mycoplasma bovis can develop pneumonia, middle ear disease, resulting in a head tilt, and arthritis with resultant reduced growth. In addition to these clinical signs, affected adult cattle can also develop mastitis. The M. bovis bacterium has little effect on other production animals, and does not affect horses and or pets, although they can be carriers.
With limited knowledge available on the distribution of M. bovis throughout Scotland and how it may be spreading within and between farms, the veterinary services team at Scotland's Rural College is now looking for Scottish dairy farms to participate in a year-long study consisting of bulk tank milk sampling and a short questionnaire on general herd management.
Throughout the project, participating farms will be provided with their own results via their registered veterinary practice.
M. bovis is spread between animals via a number of routes, with the most common being direct contact with an infected individual animal. Infection is also spread in the milking parlour, in bedding and in feeding equipment, and there is evidence that milk and colostrum from infected cows is also a source of infection to calves. Recently, semen from infected bulls has also been identified as a possible route of spread.
As well as being impervious to penicillin, M. bovis can also alter its structure, allowing it to evade the cow’s immune system. Animals which recover from infection may become carriers of the pathogen – but the existence of this carrier state is poorly understood, as these animals will show no symptoms, while having the ability to spread infection to others.
Maintaining high biosecurity by operating a closed herd will limit the risk of bringing M. bovis onto a farm. Pasteurising cows’ milk and colostrum before feeding it to calves has been shown to significantly reduce the spread of M. bovis within a herd, as has disinfecting the milking parlour and feeding equipment.
Project lead Jessica Ireland-Hughes, from SRUC Veterinary Services, said: “This project will be of huge benefit to the industry as we currently don’t know how many farms have ongoing M. bovis-associated disease and which farms are more or less at risk.
“There is currently no national control scheme in place for this disease, and the results of this project will help develop more structured control plans to limit spread between and within herds, help manage the welfare and economic effects and reduce the reliance on antimicrobials.”
All Scottish dairy farmers will receive a flyer in the post from the Scottish Dairy Hub in the next week with details on how to get involved, but further information can be gleaned right away by emailing mycoplasmabovis@sruc.ac.uk
For in-depth news and views on Scottish agriculture, see this Friday’s issue of The Scottish Farmer or visit www.thescottishfarmer.co.uk
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