Investigating impact of chlamydia on sheep health

Investigating impact of chlamydia on sheep health

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Dr Tom Clune is undertaking a PhD in infectious diseases recognised for causing reproductive losses in sheep. Photo: AWI

Dr Tom Clune is undertaking a PhD in infectious diseases recognised for causing reproductive losses in sheep. Photo: AWI

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A new project is investigating the role that chlamydia has on sheep health and lamb losses in Australian flocks.

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A new AWI-sponsored project is investigating the role that chlamydia has on sheep health and lamb losses in Australian flocks, and aims to develop a simple, cost effective test for the disease.

Dr Tom Clune, who is currently undertaking a PhD research project at Murdoch University, will undertake the 12-month project through an AWI-sponsored Science and Innovation Award for Young People in Agriculture.

Growing up on a sheep farm near Geraldton, WA, Dr Clune developed an appreciation for the importance of animal health and welfare from a young age.

It led to a career as a veterinarian, and the start of a PhD in infectious diseases recognised for causing reproductive losses in sheep.

"This new project complements my current PhD project and will improve the sheep industry's understanding of how chlamydia infections might contribute to lamb losses," he said.

"Reducing lamb wastage is a priority for the sheep industry, as it will improve farm productivity and animal welfare, and address risks to community support for wool production.

"Lamb loss between mid-pregnancy and weaning is associated with a $1 billion annual productivity loss for Australian agriculture, yet the underlying causes of pregnancy losses and still births remain poorly understood.

"Preliminary findings from my PhD project have indicated that chlamydia is a disease that might have been overlooked.

"In conducting my PhD fieldwork in 2018-19 on 10 WA farms, I found chlamydia infections were present in more than half of abortion or still born cases, suggesting chlamydia might cause significant wastage under some circumstances, although the wider economic impacts of the disease are not known."

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The chlamydia bacteria that causes disease in sheep is different to the bacteria that causes disease in humans.

Chlamydia pecorum is widespread in Australian sheep, and healthy sheep shed the bacteria in faeces.

The new study will, for the first time, characterise abortigenic strains of chlamydia using genome sequencing tools.

The project will utilise the tissue samples already obtained as part of Dr Clune's PhD, reducing costs and risks involved with field work, and with no need for additional animal use.

"Through this project I aim to discover the chlamydia bacteria's distribution, transmission and factors that determine how that leads to abortions or still births or the birth of weak lambs," he said.

"This new knowledge will underpin recommendations for sheep producers to manage the disease, with production and welfare implications."

As part of the project, he also plans to develop a quick, cheap and portable tool for diagnosing chlamydia in sheep.

It will be based upon a test already developed for detecting infections in wildlife and horses.

"It takes about 45 minutes to run, so vets can either take it out onto the farm or take samples and take it back to the clinic," he said.

"There are other diagnostic tests available, but this would be much cheaper and have a quicker turnaround so vets can work with the farmer to make timely decisions about controlling an outbreak."

This project will involve collaboration between Murdoch University, the Department Primary Industries and Regional Development WA and the University of the Sunshine Coast.

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The story Investigating impact of chlamydia on sheep health first appeared on Farm Online.

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