AHDB's TB Free Fortnight starts today!

Bovine viral diarrhoea (BVD) is one of the biggest disease issues facing the cattle industry today costing UK farmers in total between £25-£61m. The BVDFree England Scheme is the national, voluntary, industry-led scheme, launched on 1 July 2016 with the aim of eliminating BVD from all cattle in England by 2022.

The scheme is built around a national database which is searchable for results of individual animals and herds testing for BVD under the scheme.

By entering a UK tag number, an individual animal's BVD status can be found or you can search the database for a herd's BVD status using the CPH number.

This provides farmers with recognition, confidence and traceability when buying and selling BVDFree cattle.

The majority of BVD infections occur after birth. Signs of BVD aren't always obvious and the costs can be hidden:

  • Reproductive losses - early embryonic death, returns to service, abortions
  • Secondary disease - immune suppression increases the chances of pneumonia and scour in calves, lameness and mastitis in adults
  • Poor production - lower milk yield, poor growth rates, increased cull rates
  • Deaths - commonly through secondary infection

Persistently Infected animals (PIs)
If cows and heifers become infected within the first 120 days of gestation, the unborn calf may become persistently infected or PI. A calf will only become PI if its mother is infected during pregnancy; it cannot become PI after birth. 

PIs will shed high quantities of BVD virus into their environment for life. They are the most significant source of infection to other cattle.

Within infected herds, PIs often only account for 1 or 2 out of every 100 animals. It is contact with these PI animals that leads to infection of other animals within your herd, causing the signs listed above.

How does BVD spread?

BVD virus is commonly spread

  • from infected dams to their unborn calf
  • through the semen of infected bulls
  • from nose to nose contact with infected carriers.

Vaccinating can help control the disease - but will not eradicate the disease in infected stock - so you might be vaccinating and still have BVD on your farm. 

Many UK herds have already been exposed to the virus, but there are many at constant risk of re-introduction of the disease due to:

  • unknowingly buying in PI animals
  • infection from neighbouring farms
  • contact with infected animals at markets and shows

How can I tell if I have PI animals?

Sometimes PIs have stunted growth and rough coats, although more frequently they will appear completely normal.

Antibody tests can be used to tell you whether your herd has been exposed to BVD. Identification of individual PI animals can be done through testing blood or tissue samples.

All PI animals, once identified, must be removed from the herd. This is essential to achieve a successful BVD eradication scheme.

Talk to your vet to develop an effective screening programme to establish the BVD status of your herd.

If your vet advises a programme of vaccination call us to find out the best price BVD vaccines. Click here to see the full range of BVD vaccines available.

28th September 2020

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