Whenever new animals arrive on your holding, the herd or flock you already have is at risk. That risk is highest in the first few weeks, before you really know what the incoming stock might be carrying. Purchasing from markets, reintroducing stock after a show, or moving animals between your own fields can introduce pathogens, including BVD, Johne’s disease, respiratory viruses, and clostridial infections, that spread silently before any clinical signs appear. The cost of an outbreak in lost animals, treatment, reduced production, and the months it can take to get herd health back on track almost always outweighs the time invested in a proper quarantine and screening protocol upfront.

A practical biosecurity plan protects the animals you already own, the productivity of your operation, and the years of work that have gone into building your herd or flock genetics. At The Vale Veterinary Group, we work across Devon with livestock keepers to build biosecurity plans that fit how their operations actually run, with specific expertise in two of the most economically significant movement-linked diseases through our work as BCVA Johne’s Veterinary Advisers and BVDfree Trained Advisers. Our farm animal services cover herd health planning, testing, and the ongoing partnership that makes biosecurity a routine part of your calendar rather than a reaction to a crisis. If you are planning a purchase or want to review your current protocols, get in touch with our team and we will arrange a visit.

Biosecurity Essentials at a Glance

  • Movements are the top risk pathway: animal movements are the single highest-risk route for disease onto a holding.
  • 30 days of quarantine prevents most outbreaks: with testing appropriate to the species and source.
  • Pre-purchase information beats post-arrival panic: health status, vaccination records, and testing are worth more than scrambling later.
  • Written protocols win: consistently followed plans beat reactive responses every time.

What Does Biosecurity Actually Mean?

In practical terms, biosecurity means stopping infectious disease from getting onto your holding, or spreading once it is there, through deliberate management of animal movement, equipment, people, and the environment. The principles look the same whether you keep three sheep on a smallholding or run a commercial dairy with three hundred cows. The scale changes, the logic does not. Purchased and reintroduced animals are one of the highest-risk pathways because:

  • The incoming animal may carry pathogens your holding has never encountered
  • Transport stress temporarily suppresses immune function and increases shedding
  • Incubation periods mean an animal can look healthy on arrival and become ill days or weeks later
  • Mixing exposes your existing stock during the window of highest shedding

Those same principles scale up from a smallholding to a commercial unit without changing. The investment in protocols, in time and a bit of modest infrastructure, pays back through outbreaks you never have to deal with, productivity you do not lose, and the peace of mind of not gambling with your existing animals every time you bring stock home.

How Do You Plan Before Purchasing?

The first line of defence happens before an animal ever sets foot on your land. Many disease introductions are entirely preventable through deliberate sourcing.

Sourcing Animals From Reputable Sources

Best practices for selecting sources:

  • Know the health history of the herd or flock, asking about recent disease events, vaccination programmes, and testing status.
  • Request health certificates and vaccination records, since a reputable seller can produce documentation and a vague one is a warning sign.
  • Ask about species-specific diseases, like BVD and Johne’s for cattle, CAE/MV and CLA for sheep and goats, and Salmonella and Mycoplasma for poultry.
  • Visit source farms when possible, since healthy animals on a clean farm beat animals seen only at a market.
  • Be cautious of markets and dealers, which carry the highest pathogen load from concentrating multiple sources.
  • Verify testing for the conditions that matter, since a pre-purchase blood test is far cheaper than treating an introduction.

A pre-purchase conversation with your vet identifies the testing that genuinely matters for the species and region, since targeted screening based on real risk beats blanket testing. Reach out to our team if you want to talk through the best places to source your animals.

Disease Risks During Transport and Movement

Stress, exposure to other animals, and environmental changes during transport all increase susceptibility to disease, and AHDB’s biosecurity guidance is worth keeping in mind whenever stock changes hands. Transport, handling, and mixing suppress immune function for several days, brief contact at auctions and shows can transmit pathogens through sale rings and shared water, and incubation periods mean a healthy-looking animal may be incubating disease, with common ranges of BVD 5 to 14 days, respiratory viruses 3 to 10 days, and Johne’s months to years. Because many infections shed for days before clinical signs appear, the post-transport window is the most likely time for both clinical disease and silent shedding, and quarantine is what catches problems before they spread.

How Do You Implement Quarantine?

Quarantine is the single most important thing you can do to keep disease off your holding, and it applies to all new and returning animals, no matter how healthy they look on arrival.

Setting Up an Effective Quarantine Area

Practical guidance for creating a quarantine space:

  • Physical separation, ideally a different field or building, at minimum out of nose-to-nose contact range of around 3 metres.
  • No shared airspace, avoiding the same building as main stock even at the opposite end.
  • Separate feeding and watering equipment, dedicated and not moved between groups.
  • Dedicated clothing and footwear used only for the quarantine area.
  • Visit main stock first, then quarantine, reducing the chance of carrying pathogens to vulnerable animals.
  • Hand washing or disinfection between groups using a DEFRA-approved disinfectant, with restricted access for others during the period.

The recommended duration is at least three to four weeks for most situations, with Johne’s in particular warranting extended monitoring because of its long incubation period, and quarantine should be extended if any illness appears. Ask our team for specific quarantine recommendations, as it may change based on species of the animal and exposure concerns.

Monitoring and Testing During Quarantine

Watch appetite and water intake, attitude and behaviour, respiratory signs, diarrhoea or faecal changes, lameness, skin lesions, body condition, and temperature when an issue arises. Diagnostic testing during quarantine identifies subclinical infections before integration with the main herd, and targeted testing depends on species, source, and operation, which we work through as part of routine farm services on your holding. Daily observation and record-keeping catch small changes that would otherwise be missed, and if illness emerges, extend quarantine, treat appropriately, and reassess timing based on resolution and any further testing.

How Does Biosecurity Differ by Species?

Different livestock species come with different priority diseases and different practical quarantine considerations. The table summarises the headline concerns before the detail below:

Species Priority diseases Key quarantine steps
Cattle and dairy BVD, Johne’s, IBR, bovine TB BVD PCR, Johne’s testing, pre/post-movement TB
Sheep and goats Worms, CLA, CAE/MV, foot rot Faecal egg count, quarantine drench, hoof check
Pigs PRRS, swine dysentery, enzootic pneumonia Isolation, all-in/all-out, vehicle and people hygiene
Poultry Avian influenza, Newcastle, Salmonella Wild-bird exclusion, all-in/all-out, foot dips

Cattle and Dairy Biosecurity

Priority concerns for cattle include BVD, Johne’s, IBR, bovine TB, leptospirosis, and salmonella. UK biosecurity on dairy farms is well established, with BVDfree and Johne’s accreditation schemes providing structured routes for two high-impact diseases, and the “make your farm a fortress” cattle guide sets out the practical measures step by step.

Testing on incoming cattle typically breaks down like this:

Our dairy services and beef services build biosecurity into routine herd planning, with the testing and vaccinations you need to keep your farm safe.

Sheep and Goat Biosecurity

Small ruminants introduce internal parasites including resistant gut worms, plus CLA, CAE/Maedi Visna, Johne’s, foot rot, and scab, and biosecurity on sheep farms follows a few clear steps.

  • Run faecal egg counts on arrival
  • Use a strategic quarantine drench of two anthelmintics with different modes of action followed by a faecal egg count to confirm efficacy
  • Inspect and trim hooves since foot rot is highly contagious
  • Body condition score to flag animals not thriving
  • Update clostridial vaccinations

The “make your farm a fortress” sheep guide walks through the same principles in detail for a flock. Our sheep services include flock health planning that addresses biosecurity alongside production.

Pig Biosecurity

Pigs bring their own priority diseases, including PRRS, swine dysentery, enzootic pneumonia, and Salmonella, alongside the notifiable threats of African and classical swine fever and swine flu. Biosecurity on pig farms leans heavily on strict isolation of incoming pigs, all-in/all-out management, and tight control of vehicles, people, and equipment, since pig diseases travel easily on boots, tyres, and shared kit. Source from known herds with a clear health status, isolate new arrivals well away from your existing pigs, and keep feed and bedding secure from wild birds and vermin. Smallholders keeping a few pigs follow the same logic on a smaller scale, and we are glad to help you set it up.

Poultry Flock Biosecurity

Poultry biosecurity has unique challenges because avian diseases transmit so rapidly, and the British Poultry Council’s plan, prevent, protect approach sets out the essentials: prevent contact with wild birds and rodents, sanitise footwear and equipment with foot dips at entry, use all-in/all-out management where practical, and recognise signs like sudden mortality, respiratory signs, or dropped egg production. Avian influenza and Newcastle disease are notifiable, so suspected cases must be reported to APHA. Keepers in England can also access funding for a poultry biosecurity review carried out with their vet. For backyard keepers, our smallholder services provide accessible advice without requiring a large operation.

What About Show Animals and Reintroduction?

Animals attending shows, fairs, or breeding facilities face elevated risk because they mix with animals from multiple sources, and a clear set of protocols helps keep post-show transmission in check. Before departure, complete a health examination, confirm vaccinations, treat for parasites if appropriate, and dedicate cleaned equipment to that animal. At the event, limit nose-to-nose contact, use only your own equipment, wash hands between handling your animals and any others, and avoid shared bedding. Upon return, quarantine for at least three to four weeks even if animals appear healthy, monitor for respiratory signs or scours, test if recommended, and disinfect the trailer and equipment thoroughly. Even short trips carry biosecurity implications, and a clear post-show protocol is what stops the multi-farm transmission events that can ripple through a region after a popular show.

How Do You Build a Biosecurity Plan?

Individual purchases benefit from individual quarantine, but the highest-value work happens at the operation level, in written, farm-specific plans you actually use.

Creating Written Protocols for Your Operation

A written plan covers animal sourcing standards, quarantine protocols, visitor policies, equipment sanitation, and disease response plans. The same principles scale down to small operations, and a hub of useful biosecurity resources helps whether you run a commercial unit or keep a few animals. Written plans ensure consistency when multiple people work the farm, provide a reference during stressful situations, and make training new staff straightforward. A practical approach starts with an honest assessment of current practices, sets realistic protocols that fit the operation rather than aspirational ones, trains family and workers, reviews annually and after incidents, and coordinates with neighbouring producers on shared risks like boundary fencing and watercourses.

In England, the Animal Health and Welfare Pathway helps fund the vet time behind much of this, including health reviews and endemic disease testing for cattle, sheep, and pigs. It is well worth asking us what your operation may be eligible for.

What Your Vet Adds to a Biosecurity Plan

An established veterinary relationship is what makes biosecurity work day to day. That looks like guidance on species- and region-specific testing, vaccination timing, rapid disease recognition, regulatory compliance support, diagnostic access, periodic health evaluations, and awareness of what is moving around the region. For Vale clients, our farm vets are available for herd visits, telephone consultations, and the ongoing relationship that catches problems early, and our small animal services cover the companion animals on the same holdings. To bring us in on a plan or a specific purchase, get in touch with our farm team.

Veterinarian examining a cow on a farm during a routine livestock health check and veterinary assessment.

Frequently Asked Questions About Farm Animal Biosecurity

How Long Do New Animals Really Need to Be Quarantined?

At least 30 days for most situations. Some diseases require longer observation, and Johne’s testing specifically often warrants extended monitoring because of the long incubation period. If illness emerges during quarantine, extend until resolved and reassess.

What Testing Should I Actually Do on Purchased Animals?

It depends on the species, source, and what diseases matter most to your operation. Generic blanket testing wastes money, while targeted testing based on real risk produces value, so a conversation with us about your specific situation is the best way to identify what makes sense.

My Animals Are Only Going to a Local Show for a Day. Do I Really Need Quarantine on Return?

You do, even for short trips. Brief contact at a show can transmit pathogens that emerge days later, so three to four weeks of monitoring with separation from main stock is appropriate after any time away.

What if a Disease Emerges in Quarantine?

Extend the quarantine, treat as appropriate based on diagnosis, and do not integrate until the issue is fully resolved. Get diagnostic samples early so the cause is identified rather than guessed at, since treatment without diagnosis often fails.

Protecting Your Animals Through Smart Biosecurity

Protecting the animals you already own is the whole point of biosecurity, and the protocols that feel like extra work in calm weeks are the ones that stop a single disease introduction from turning into a herd-wide event. We are here to help you build, review, or adapt a plan that fits your operation. To talk through a pre-purchase question, a quarantine setup, or a full herd health review, get in touch with our farm team.