Keeping Pigs Is Rewarding — Until Something Goes Wrong
Smallholder pig keeping has grown steadily in the UK over the past decade, with more people raising a small number of pigs for their own pork or as part of a diversified holding. What many new keepers underestimate is how quickly health problems can escalate in pigs, and how strict the legal framework around pig medication is. Getting both the husbandry and the compliance right from the start prevents significant problems later.
Registration and Legal Obligations Before You Begin
In the UK, anyone keeping pigs — even a single animal — must register with their local Animal and Plant Health Agency (APHA) office and obtain a County Parish Holding (CPH) number. You must also have a herd number. Movement of pigs requires an Animal Movement Licence (AML). These are not optional; they are legal requirements. Failure to comply can result in prosecution. Equivalent regulations apply in Scotland, Wales, and Northern Ireland, administered through the respective devolved agencies.
Common Health Conditions in Smallholder Pigs
Respiratory Disease
Enzootic pneumonia (caused by Mycoplasma hyopneumoniae) is widespread in pig populations and causes a chronic, non-productive cough, reduced growth rate, and increased susceptibility to secondary bacterial infections. Porcine Reproductive and Respiratory Syndrome (PRRS) is a viral disease with devastating effects on reproduction and respiratory health. Both are more common in larger units but can affect smallholders who buy in stock from infected sources. Buying from accredited high-health herds and maintaining strict biosecurity reduces risk substantially.
Erysipelas
Erysipelas (caused by Erysipelothrix rhusiopathiae) is one of the most important diseases in smallholder pigs. It presents in three forms: acute septicaemia (sudden death or fever with diamond-shaped skin lesions), subacute urticarial form (the classic diamond skin lesion without severe systemic illness), and chronic form (arthritis and heart valve lesions). Vaccination is highly effective and strongly recommended. Penicillin is the treatment of choice for acute cases, but always under veterinary direction.
Swine Dysentery and Enteric Disease
Diarrhoea in pigs can have multiple causes depending on age: E. coli in neonates and young piglets, rotavirus and coccidiosis in slightly older piglets, and Brachyspira hyodysenteriae (swine dysentery) in growers. Post-weaning multisystemic wasting syndrome (PMWS) caused by porcine circovirus type 2 (PCV2) can cause significant mortality in weaned pigs. Good hygiene, prompt investigation of enteric disease, and vaccination programmes for PCV2 and erysipelas are practical control measures.
Mange and External Parasites
Sarcoptic mange (Sarcoptes scabiei var. suis) causes intense pruritus, rubbing, and skin thickening. It spreads readily between pigs and is controlled through acaricide treatment of all animals in the group simultaneously, along with thorough cleaning of housing. Lice (Haematopinus suis) cause similar signs and are treated in the same way. Both conditions are almost entirely preventable through sound biosecurity when introducing new animals.
Legal Rules Around Pig Medication
The Veterinary Medicines Regulations
Pigs are classed as food-producing animals in UK law, regardless of whether the keeper intends to eat them or not. This has significant implications for medication. All prescription medicines must be prescribed by a vet under a valid veterinary client patient relationship. You cannot purchase prescription antibiotics, antiparasitic medications, or vaccines over the counter without a prescription. The use of any medicine in food-producing animals must be recorded in a medicines book, which must be kept for five years and be available for inspection.
Withdrawal Periods
Every licensed veterinary medicine used in pigs has a specified withdrawal period — the time that must elapse between last treatment and slaughter. These exist to ensure that drug residues in meat fall below safe limits. Ignoring withdrawal periods is both a legal offence and a food safety risk. If a pig is treated with any medication, the withdrawal period must be observed even if the animal is destined for home consumption rather than commercial slaughter.
The Antibiotic Stewardship Obligation
Since 2022, the UK has prohibited the preventive use of antibiotics in groups of animals where no disease has been confirmed, in line with EU regulations and the national action plan on antimicrobial resistance. Antibiotics must be used to treat confirmed or strongly suspected bacterial disease, not as a routine growth-promotion or prevention tool. Your vet will guide prescribing decisions within this framework.
Vaccination Recommendations for Smallholder Pigs
- Erysipelas: strongly recommended for all breeding and growing pigs; two-dose primary course followed by six-monthly or pre-farrowing boosters
- Porcine circovirus type 2 (PCV2): recommended particularly for weaned pigs; discuss with your vet based on source herd status
- Parvovirus and leptospirosis: relevant in breeding animals; your vet will advise based on local risk
Key Practical Points for Smallholders
- Register your holding and obtain a CPH number before acquiring any pigs
- Source pigs from reputable, high-health suppliers and quarantine all new arrivals for at least three weeks
- Establish a relationship with a pig-experienced vet from the outset
- Vaccinate against erysipelas as a minimum; review broader vaccination needs with your vet
- Keep a medicines book recording all treatments, doses, and withdrawal periods
- Never medicate food-producing animals with prescription medicines without a valid veterinary prescription
- Maintain good hygiene in housing; mange and enteric disease thrive in dirty, overcrowded conditions
- Any suspicion of a notifiable disease (foot-and-mouth, African swine fever, classical swine fever, swine vesicular disease) must be reported to APHA immediately
Pigs are intelligent, sociable animals that can be enormously rewarding to keep. A good relationship with a vet who has experience in swine medicine is the single most important resource a smallholder pig keeper can have.