Working with the weather to manage parasites of livestock in changing climates

Parasites can be found in every environment on earth and infect a wide range of hosts – birds, fish, plants, insects, wild animals, domesticated animals and humans.  When parasites are discussed they often trigger an “ewww” reaction.  However, they have much more serious economic, food security and animal health and welfare impacts when they infect grazing livestock.  Grazing livestock contribute greatly to food security and this is not going to change any time soon.  Not only is the global population (and therefore food requirement) growing, there is an increasing demand for animal-based food products in developing regions and there is an essential role of animal products in marginal environments where crop production is infeasible.  Parasite control is therefore vital, but is not easy to achieve.

Many parasites have complex lifecycles which depend upon specific climatic conditions.  For instance, temperature and moisture determine development rates and survival.  Farmers could once use this to their advantage as the predictable, seasonal weather patterns led to predictable, seasonal patterns of parasites.  Reliable livestock husbandry practices therefore developed for parasite management.  However, in recent years there have been changes in climate and less predictable weather patterns.  Traditional management practices are often no longer effective as parasites are being found in unexpected regions and at unexpected times of year.  What’s more, whilst other organisms are being put under threat by climate change, parasites are successfully evolving and adapting to these changes in environment due to their short reproductive cycles.

Predicting the risk of infection to parasites involves multiple areas of expertise.  An in-depth knowledge of parasite characteristics is essential, and needs to be updated as they evolve.  Accurate forecasts for climate are also needed to help predict which regions may have an environment suitable for the parasite and changes to its seasonality.  An accurate forecast for weather (daily climatic conditions) is essential for certain parasites.  Combining historical data with forecasts, knowledge of the parasite’s requirements for development and farm characteristics (such as altitude and orientation) within complex models gives precise information on infection risk and helps farmers to be one step ahead of the parasites.  Technology is also aiding the rapid diagnosis of specific parasite infections to guide effective management practices.

Despite these advancements in parasite control, uptake of the technologies by farmers is often slow. The science behind parasites and the models developed are complicated and daunting.  Livestock farming is demanding, both economically and in terms of labour.  Therefore farmers need these complex technologies to be transformed into tools that are still effective, yet simple and easy to integrate into their current practices.  They need to feel confident in using the tools and understand the benefits that come with them – not the science.  These benefits include more efficient animals, both economically and environmentally, and improved animal health and welfare.

There is still much to learn about parasites. The rapid changes to the environment, the livestock industry and the parasites themselves means that this is an area of work that will be ongoing for the foreseeable future.  There is a huge need for collaboration between disciplines to not only develop the tools, but also to communicate their need and promote their use on farms.  This barrier to technology uptake could be a bigger hurdle for scientists than technology development itself.

 
This blog is written by Cabot Institute member Olivia Godber, a PhD student in the School of Biological Sciences at the University of Bristol.
 

Fostering interdisciplinarity in sustainable development

On 15 October 2014, we had a fascinating talk from Prof. Wendy Gibson from the University of Bristol’s School of Biological Sciences launching the University’s ‘Sustainable Development and Poverty Reduction: Capacity Building in the face of Environmental Uncertainty’ network.

The Cabot Institute is supporting a number of ventures to foster an interdisciplinary network of academics across the University, whose work can be included under the broad ‘development studies’/’international development’ umbrella, due to its direct or indirect impact on sustainable development and poverty reduction in the Global South.

Uniquely, at Bristol, this includes academics working in the social sciences, but also in Physical Geography, Earth Sciences, Public Health, Engineering, Biological and Veterinary Sciences, to name but a few.  This ‘International Development Discussion Forum’ will have a regular monthly slot and it is therefore hoped that participants will come regularly, not because they may be specialists in the topic of that month’s presentation, but in order to hear the kinds of questions that parasitologists, or engineers, or lawyers, for example, raise for development research; questions that they can, in turn, contribute to from their own discipline.

Coping with parasitic diseases in Africa

 

Trypanosomes in human blood.
Credit: University of Bristol

The topic of Wendy’s talk was the extensive research she has undertaken as a parasitologist on the tsetse fly as a vector for trypanosomes, parasites which cause African sleeping sickness, or HAT – Human African Trypanosomiasis.  In light of the global media coverage of the Ebola outbreak, Wendy’s measured reminder about the ongoing impact of a lower profile disease such as HAT, on people and animals in rural areas of sub-Saharan Africa, was sobering.  Not only does the disease have a devastating impact on affected communities, but diagnosis and the treatment of the disease are extremely unpleasant and involve protracted intervention.  In situations in which people are coping with a range of daily hardships that impact upon their livelihoods, including drought, poor forage and a range of different diseases affecting human and animal populations, disease-focused approaches often fail to recognise this reality.

Interdisciplinary challenges in rural healthcare

After the talk, participants were asked to focus on three specific challenges identified by Wendy:

  1. How to maintain momentum in control programs as we move towards disease eradication.
  2. How to prioritise disease risks with a finite health budget.
  3. How to get different government departments to co-operate on shared goals.

Given that the subject clearly raised so many issues relating to the challenges of public health care in sub-Saharan Africa – including issues relating to rural (as opposed to urban) poverty, governance and the state, aid and non-governmental organisations – discussions were wide-ranging.  Rather than proffering standard academic critique of the material presented, participants were asked to focus on what they, positioned as they are within their own discipline, could bring to the table.  Consequently, it was fascinating how different tables touched upon similar issues but nevertheless raised specific insights depending on the differing make-up of the tables and the expertise included on them.

Specific challenges identified included:

  •  ongoing problems with top-down interventions,
  • the forging of rural (and regional) networks,
  • the difficulties in specifying the costs of such a disease,
  • raising the profile of a such a low-profile disease when its symptoms may take some years to become manifest, and
  • the difficulties of co-ordinating NGOs, aid, and governments in relation to healthcare priorities, particularly when healthcare demands are seen to ‘compete’ with each other.

And discussions continued into the networking drinks as participants identified a number of practical and funding obstacles in undertaking the kind of real interdisciplinary research that could be of such value in responding to some of the challenges relating to a disease such as African sleeping sickness.

Quotes from participants

“I knew that some of my research might be usefully applied in developing countries, but the complex challenges and the feeling that I lack a track record in ‘development research’ put me off. Through the forum I am learning about that world, and it has been a real eye-opener. I had no idea that so much was going on across the University in this area, nor that my naivety would be treated so generously in the friendly and open discussions that we’ve had so far.”
Dr. Eric Morgan, Veterinary Parasitology and Ecology

“As a scientist I want my work to be “useful”. However, translating knowledge into effective and successful, practical outcomes takes more than just generation of that scientific knowledge. This is being increasingly recognised by funders, many of whom now have a focus on interdisciplinarity, particularly for delivering outcomes that can make a difference to people living in developing countries (e.g. the Newton Fund, but also some Research Council funding calls).  While the topic of this workshop was not within my scientific field, it was fascinating, and gave me insight into the realities and difficulties of implementing change that really does require the bringing together of many different aspects of knowledge.  I met some colleagues that would be great to collaborate with in the future in order to better deliver effective outcomes.”

Dr. Jo House, Geographical Sciences

Future discussion

On 11 November 2014, the Cabot Institute will be supporting the next discussion forum in this series in which Prof. Thorsten Wagener will be giving a talk on his ongoing work in the field of sustainable water management.  His research focuses on a systems approach, which he argues is needed to adequately understand this dynamic physical and socio-economic system with the goal to provide water security for people and nature.

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This blog has been written by Dr Elizabeth Fortin, Cabot Institute, University of Bristol Law School.