Farming

‘False positives’ must be eliminated

Published

10 years ago

March 12, 2015

New bovine TB tests needed?: Cambridge University has recommended

A NEW study performed by researchers from Cambridge University has recommended that new tests are needed to make vaccination against bovine tuberculosis (bovine TB). The report points out that in order for vaccination to be viable, the number of false positives from these tests must be significantly reduced. The scientists have said the reduction in false positives in cattle is feasible, but that a vaccination programme would be challenging. Despite an intensive, and costly, control program in the United Kingdom, bovine TB persists. Although vaccinating cattle with the human BCG vaccine offers some protection in cattle, doing so is currently illegal within the EU, due to the vaccine’s interference with the skin test used for surveillance.

The Cambridge team worked alongside researchers at the government’s Animal & Plant Health Agency (APHA), to show the importance of specificity – the proportion of uninfected animals that test negative – to making disease control strategies work. The skin test currently in use has a very high estimated specificity of over 99.97%, which means that less than three animals in 10,000 will test falsely positive. However, the test as carried out in Great Britain is thought to have at best an 80% sensitivity – a measure of how many infected animals will correctly test positive – missing around 1 in 5 bovine TB-infected cattle. It is used to determine if animals, herds and countries are officially free of bovine TB.

Vaccinated animals that test positive have to be treated as infected animals. Under European law, if an animal tests positive, it must be slaughtered. The remaining herd is put under movement restrictions and tested repeatedly using both the skin test and post-mortem examinations until it can be shown to be officially clear of infection. Researchers said the duration of movement restrictions is important due to the considerable economic burden they place on farms. Also, the cost to the UK government alone is estimated to amount to half a billion pounds over the last decade; this cost includes visits to farms by veterinarians, tests carried out and compensation for the slaughter of infected animals.

For vaccination to be economically viable and acceptable within the EU, the benefits of vaccination must be great enough to outweigh any increase in testing. A new generation of diagnostic tests, known as ‘Differentiate Vaccinated from Infected Animals’ (DIVA) tests, has opened up the opportunity for the use of BCG within current control programmes. The EU has recently outlined the requirements for changes in legislation to allow cattle vaccination and a recent report from its European Food Safety Authority (EFSA) emphasized the importance of demonstrating that BCG vaccine works, and that DIVA tests can be shown to perform in large-scale field trials.

However, a key factor overlooked in the EU report was that the currently viable DIVA tests have a lower specificity than tuberculin testing; this could lead to vaccinated herds being unable to escape restrictions once a single test-positive animal has been detected, as the more times the herd is tested, the more likely the test is to record a false positive. In their study, the researchers from Cambridge and APHA used herd level models to show that the level of infection can be reduced in vaccinated herds even when DIVA sensitivity is lower than tuberculin skin testing.

However, in order to see this benefit of vaccination over 99.85% of uninfected animals will need to test negative in the DIVA test. This improved accuracy will be necessary to avoid increasing the duration of breakdowns and the number of animals condemned. Using data from previous tests on cattle, the researchers said this level of ‘specificity’ is achievable, though they said there will be challenges associated with improving accuracy. The researchers said, “Currently, there is no gold standard test to diagnose TB in cattle. Cattle that test positive are slaughtered immediately and therefore have rarely developed any physical signs – in fact, only around a half of animals examined post-mortem show physical signs of infection even if they are, indeed, infected.”

Dr Andrew Conlan from the Department of Veterinary Medicine at the University of Cambridge explained “In order for vaccination to be viable, we will need a DIVA test that has extremely high specificity. If the specificity is not good enough, the test will find false positives, leading to restrictions being put in place and a significant financial burden for the farmer. “But validating a test that has a very high specificity will in itself be an enormous challenge. We would potentially need to vaccinate, test and kill a large number of animals in order to be confident the test is accurate. This would be very expensive.”

Farming

Special farming role for senior Pembrokeshire councillor

Published

4 days ago

December 17, 2024

Bruce Sinclair - Local Democracy Reporter

AN OFFICIAL special farming role for Pembrokeshire’s deputy leader is to be established following a call made to full council, the first time the council has had such a role for a senior member.

In a question to council leader Cllr Jon Harvey, heard at the December meeting of Pembrokeshire County Council’s full council meeting, Conservative group leader Cllr Di Clements asked: “With the recent changes in the budget from the UK Labour Government on Inheritance Tax and Agricultural Property Relief, many Pembrokeshire farmers are feeling concerned for the future of their family farms, many in Pembrokeshire which have been in the same family for generations.

“I have always found it disappointing that in all the years I have been a councillor, and the major contribution farming has to this county’s economic, cultural and environmental well-being, there has never been a Cabinet Member’s title with rural affairs or farming, or agriculture within it.

“To show that this council recognises the importance of agriculture, and the hundreds of millions of pounds generated by farming, will the Leader consider including it in one of the titles of his Cabinet Members’ portfolio?”

Responding, Cllr Harvey said: “I full share your perspective; it’s true this council has never had a Cabinet member with this role; however I can reconsider, I regard all aspects of rural life as vitally important.”

He told members farming and rural affairs came under the portfolio of the deputy leader [Cllr Paul Miller], adding: “we’re all aware of the changing aspects of rural life at the moment, we do have a rural affairs champion in Cllr Steve Alderman, but I’ve had a conversation with the deputy leader and agreed to review this title to reflect the importance of the role and will happily make an announcement in the next few days.”

Cllr Clements responded: “These words say a lot, it shows this council recognises the importance of the most constant and probably most important business in the county.”

Farming

Call for Pembrokeshire to oppose farming inheritance tax withdrawn

Published

1 week ago

December 14, 2024

Bruce Sinclair - Local Democracy Reporter

A CALL on Pembrokeshire County Council to oppose government changes to inheritance tax affecting family farms has been withdrawn, but its proposer hopes his motion will return to a future meeting.

At the Budget, Chancellor Rachel Reeves announced farmers would have to pay inheritance tax on agricultural property and land worth more than £1 million at a rate of 20 per cent, with a £3m threshold for couples passing on their farms.

This compares to a 40 per cent rate on other estates.

A Notice of Motion by Councillor Aled Thomas, ‘relating to Protecting British Family Farms and Preserving Rural Communities’ was to be heard at the December 12 meeting of Pembrokeshire County Council’s full council meeting.

Cllr Thomas, who stood as a Conservative candidate for Ceredigion-Preseli in the 2024 general election, asked that: “Pembrokeshire County Council notes its concern to the proposed changes to inheritance tax announced by the Labour Government in the recent Autumn budget, which would scrap Agricultural Property Relief (APR).

“APR has been instrumental in allowing British family farms to remain intact across generations, supporting food security, sustaining rural communities, and aiding environmental stewardship. This tax is estimated to impact over 70,000 family farms, leaving the average farming family with a tax bill of at least £240,000, which will force many to sell portions of their land or close entirely, paving the way for corporate ownership over family ownership.”

It called on the council to resolve to “oppose the Labour Government’s changes to inheritance tax affecting family farms,” to “advocate for the exemption of family farms to preserve the UK’s food security, rural communities, environmental initiatives,” and to “commit to maintaining its county council farms portfolio, particularly to encourage younger and new generations of farmers into the industry”.

It finished: “This council urges all councillors to stand with Britain’s family farms, to support our rural communities, and to protect the environment by formally rejecting this proposed ‘family farm tax’.”

At the December 12 meeting Presiding Member Cllr Simon Hancock informed members the notice had been withdrawn from the meeting.

Speaking after the announcement, Cllr Thomas, himself a farmer, said: “There was a dispute whether I should have been allowed to submit it as I am a farmer, so I took advice from the monitoring officer that I should withdraw it until I can get a dispensation from the standards committee to speak on the matter.”

He said he hoped to get the motion resubmitted to be heard at the next council meeting.

Farming

Welsh Lamb shines at the Winter Fair Taste Awards

Published

1 week ago

December 12, 2024

Tom Sinclair

THE ROYAL WELSH WINTER FAIR TASTE AWARDS, showcasing the finest native lamb breeds of Wales in a celebration of sustainability, flavour and culinary excellence, were hosted by the Royal Welsh Agricultural Society (RWAS).

The awards, held in collaboration with Cambrian Training Company, the Culinary Association of Wales and the National Culinary Team Wales, spotlighted the exceptional quality of Welsh Lamb and its unique characteristics.

The competition aimed to promote native Welsh Lamb breeds and emphasise their distinct flavours, encouraging chefs, businesses and consumers to consider Welsh Lamb a premium product.

The RWAS says the competition provides a vital platform to showcase the exceptional flavours of native Welsh Lamb breeds while promoting sustainable farming practices.

These lambs are grass-fed, raised in Wales and come with full traceability from farm to fork. The initiative aims to highlight the story behind the meat and the dedicated efforts of farmers in preserving these breeds.

Societies representing seven native Welsh Lamb breeds participated in the competition, held at the Cambrian Training Company building on the Royal Welsh Showground at Llanelwedd.

Each breed’s lamb was expertly cooked by chefs and presented to a distinguished panel of judges, including Dilwyn Evans, a vet featured on TV series ‘Clarkson’s Farm’, Steven Owen, Castell Howell development chef, Neil Fenn, Professor Rhian Goodfellow, OBE and Arwyn Watkins, OBE, executive chair of Cambrian Training Group.

The breeds showcased included Badger Face Welsh Mountain (Torddu and Torwen), Balwen Welsh Mountain, Black Welsh Mountain, Clun Forest, South Wales Mountain, Llanwenog and Pedigree Welsh Mountain.

Each lamb had been bred, born and reared in Wales, ensuring sustainable and traceable farming practices.

The awards highlighted the diversity among native Welsh Lamb breeds, from the Torddu and Torwen’s hardy nature to the Llanwenog’s docile temperament and premium meat quality.

Farmers and breed societies demonstrated the unique traits of their lambs, such as flavour, sustainability and adaptability to diverse farming environments.

Arthur Davies (South Wales Mountain) and I. T. Davies & Son (Clun Forest) were declared joint winners of the Royal Welsh Winter Fair Taste Awards. Both breeds impressed the judges with their remarkable flavour, tenderness and quality, showcasing the very best of Welsh Lamb.

The event emphasised the importance of promoting the culinary excellence of Welsh Lamb alongside its visual appeal in show rings.

Guest judge, Dilwyn Evans said: “It has been an absolute honour to judge the Royal Welsh Winter Fair Taste Awards and experience first-hand the superior taste of native Welsh Lamb.

“This exceptional meat not only embodies the rich heritage and dedication of Welsh farming but also highlights the importance of preserving these unique breeds and the sustainable practices behind them.”

The RWAS thanked the judges and Cambrian Training Group for their continued support, helping ensure the lambs were cooked to perfection for the competition.

With the awards, Wales has cemented its position as a leader in premium lamb production, bringing the exceptional flavours of its native breeds to the forefront of the culinary world.