Farm Visitor Biosecurity: Protecting Your Herd from Introduced Pathogens

Why Visitors Are a Biosecurity Risk

A dairy farm is a controlled biological environment. Every external visitor — a veterinarian, a technician, a feed delivery driver, a buyer inspecting cattle — brings organisms from other farms, processing facilities, or the general environment. The most significant farm-to-farm disease transmission routes are:

• Footwear and clothing: manure, soil, and biological material on boots carry Salmonella, E. coli, Clostridium, foot-and-mouth disease virus, Mycoplasma, and digital dermatitis pathogens (Treponema)
• Vehicles and tires: truck tires entering the farm carry soil and manure from every location visited before yours
• Equipment: shared equipment (pregnancy scanners, hoof-trimming equipment, milk sampling equipment) is a direct transfer vehicle for pathogens

The Minimum Acceptable Visitor Protocol

For all visitors:

1. No access to livestock areas without farm-provided or farm-disinfected footwear
2. Foot dip entry and exit — a properly maintained footbath with an active disinfectant at the entry point to all cattle areas
3. Hand disinfection before contact with animals
4. Declaration of farms visited in the preceding 72 hours for high-risk operations

For vehicle access:

• Dedicated vehicle disinfection spray point at the farm gate for wheels and wheel wells
• Do not allow vehicles that have been at slaughterhouses, livestock markets, or other farms to drive into the livestock area without disinfection

Products for Visitor Footbaths and Vehicle Disinfection

DIO A+B: two-component general farm disinfectant effective against bacteria, viruses, and spores. Appropriate for high-challenge applications including visitor footbaths and vehicle wheel washing.

N421: farm hygiene disinfectant for general area disinfection. Suitable for surface disinfection of equipment brought onto the farm by external technicians.

Anderma Hoof Liquid: suitable for use in visitor footbaths specifically targeting digital dermatitis pathogens. Appropriate when the primary concern is introduction of Treponema from other farms.

Making Visitor Biosecurity Practical

Visitor biosecurity fails when it is inconvenient to execute. Practical design:

• Place the footbath at the only practical entry point to the cattle area — not inside the barn where it can be walked around
• Use a covered footbath that retains solution quality in rain and maintains concentration in hot weather
• Have disposable boot covers or dedicated farm boots available at the entry point — most visitors will not have clean boots and will comply with a cover rather than a boot change
• Post the protocol visibly at the farm entrance — most visitors will follow clear written instructions

Contact AgroLyne for disinfectant product recommendations for visitor and vehicle biosecurity programs.