Sheep farmers heading into the busiest trading window of the year have been told to treat every purchase as a potential disease risk.
Cases climbing fast as sales season looms
Sheep farmers heading into the busiest trading window of the year have been told to treat every purchase as a potential disease risk. The National Sheep Association and the Sheep Veterinary Society have issued a joint buyer beware warning, saying the BTV-3 outbreak is spreading faster than official case counts can capture.
In a joint statement released this week, NSA chief executive Phil Stocker and SVS president Phillipa Page said the situation is already far worse than Defra’s published figures suggest. Reporting lags mean the true number of affected holdings is unknown, but both organisations describe case levels in the South West as unprecedented.
“The emergence of BTV-3 cases across the UK is rapidly growing. The south west is dealing with an unprecedented number of reported cases, and we also know that there is a time lag in reporting, so the situation is far worse than the figures suggest,” they said.
The timing could hardly be worse. August through October is when breeding sheep, ewe lambs and store lambs change hands in their thousands at markets from Lockerbie to Exeter. Every movement is an opportunity for midge-borne virus to hitch a ride into a new flock, and the NSA and SVS want buyers thinking hard before they bid.
Why this outbreak is different
Bluetongue has been a background threat since BTV-3 first reached England in 2023 and returned in force last year. What has changed is the volume. Stocker and Page say the density of reported cases in the South West this summer is unlike anything they’ve dealt with before, and that’s putting every livestock movement under a cloud.
The virus spreads via Culicoides midges, not direct contact, but that doesn’t make trading safe. Midges don’t respect market boundaries, and infected animals moved into clean areas create new infection hotspots once local midge populations bite them. A ewe that looks fine in the sale ring can be incubating virus and fall sick days or weeks after arriving on the buyer’s holding.
There is also a fertility angle that often gets overlooked. BTV-3 can affect ram fertility, which is why the NSA and SVS are flagging specific concerns about purchased tups heading into the tupping season. A ram that survives the virus may not be working at full capacity when it matters most.
What This Means for Farmers
In practical terms, this warning will reshape how ram and ewe sales play out over the next eight weeks. Expect vaccinated, fully immune sheep to carry a premium at ringside. We’ve already seen this play out in restricted zones previously, where buyers actively avoid anything without two clean vaccination doses and the 28-day immunity window behind them. This year, with the South West under pressure and cases spreading east and north, that caution is likely to spread with it.
For pedigree and commercial breeders selling stock, the message is to get paperwork, vaccine records and dates of last dose ready before sale day. Vague assurances won’t cut it. Buyers will want to see evidence, and vendors who can provide it will find their sheep easier to sell and likely better priced.
For buyers, the old rule of buying with your head as much as your eyes has rarely been more relevant. The cheapest pen of ewe lambs in the catalogue could end up costing a flock if they arrive unvaccinated into a midge-active area. Quarantine, observation and pre-tupping fertility testing on rams aren’t optional extras this season. They’re the baseline. Anyone skipping those steps to save a few days is gambling with their flock’s health and, by extension, their neighbours’.
There’s also a wider sector risk. If BTV-3 keeps spreading into cleaner areas through autumn sales, we’ll see movement restrictions tighten, export markets wobble, and another round of pressure on an industry already squeezed by input costs and tight margins. The NSA and SVS are clearly trying to get ahead of that scenario rather than react to it.
What to Do Next
First, if you haven’t already vaccinated, talk to your vet now. The licensed BTV-3 vaccines require two doses, and immunity takes around 28 days to build properly after the second jab. Time is running short for animals being bought at main autumn sales.
Second, treat any purchase as a potential risk. Isolate bought-in sheep for at least seven days, watch them closely for signs of bluetongue (mouth ulcers, lameness, swollen tongue, fever, sudden deaths), and don’t mix them with the main flock until you’re confident they’re clear.
Third, on rams specifically, factor in a fertility test before tupping. If a ram has been through a BTV-3 infection, semen quality can be impaired for weeks. A pre-tupping semen eval costing around £30 to £80 could save an empty ewes at scanning.
Fourth, ask for vaccination evidence at the point of sale. If the vendor can’t supply dates and batch numbers, walk away or price accordingly. The NSA and SVS have made clear that buyer responsibility runs both ways, but vendors who can’t evidence their vaccination status will find buyers voting with their feet.
Finally, report any suspicion. Stocker and Page are explicit that case numbers are understated. If you see clinical signs, call your vet and Defra. Better to confirm a negative than miss a positive that infects the whole neighbourhood.
Frequently Asked Questions
Why are NSA and SVS warning buyers about bluetongue now?
BTV-3 cases are rising rapidly and the peak is expected to coincide with the busiest period for breeding and store sheep sales. Because reporting lags, the organisations say the real case load is far higher than official figures show, putting unvaccinated bought-in stock at real risk.
Can vaccinated sheep still catch bluetongue?
Yes, if they’re exposed before immunity has fully built. Animals vaccinated less than 28 days before sale, or those exposed to infected midges before completing the course, can still develop disease. That’s why NSA and SVS recommend continuing quarantine and observation even for vaccinated purchases.
Does buying sheep at market spread bluetongue?
Bluetongue itself isn’t passed directly from sheep to sheep, but moving animals into new midge-active areas creates new infection hotspots. An infected or incubating animal bought at market can be bitten locally, amplify the virus, and seed infection across a fresh area.
Should rams be fertility tested after a bluetongue outbreak?
Yes. BTV-3 can affect ram fertility, so NSA and SVS recommend buyers put purchased tups through strict quarantine, close observation and a fertility test before using them in the breeding season.
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Source: FarmingUK
