Why Biosecurity Determines Flock Survival
Biosecurity is the single most cost-effective investment a broiler grower can make. A disease outbreak can wipe out an entire flock in days, cost months of income from depopulation and downtime, and, in the case of reportable diseases like highly pathogenic avian influenza, trigger regulatory action that affects the entire region. The cost of implementing biosecurity protocols is negligible compared to the cost of a disease outbreak.
Effective biosecurity relies on three principles: separation, cleaning, and monitoring. These principles must be applied consistently — a biosecurity protocol is only as strong as its weakest link, and one lapse can undo weeks of careful practice.
Entry Protocols: The Front Line of Biosecurity
The Danish entry system is the gold standard for house-level biosecurity. A bench divides the clean (house-side) and dirty (outside) areas. Anyone entering the house sits on the bench, removes outdoor boots without touching the clean-side floor, rotates on the bench, and puts on house-specific boots or disposable boot covers. The same process applies in reverse when leaving.
House-specific footwear is essential. Boots should never move between houses without cleaning and disinfection. Dedicated coveralls or disposable Tyvek suits should be worn for each house entry. Hand washing or sanitizing before entering and after leaving is mandatory.
Footbaths at house entrances provide additional protection but are often mismanaged. Footbaths must contain active disinfectant at the correct concentration, be changed daily or whenever visibly contaminated, be protected from rain, sun, and freezing, and be large enough that boots can be fully submerged. A footbath full of muddy water with diluted disinfectant provides false confidence and no real protection.
Pest Control
Rodents and wild birds are major disease vectors. Mice and rats can carry Salmonella, Pasteurella, and other pathogens between houses and between farms. Wild birds can introduce avian influenza, Newcastle disease, and other pathogens directly into houses through droppings, feathers, or contaminated feed.
Rodent control requires a combination of bait stations placed every 30–50 feet around house perimeters, vegetation management to eliminate rodent harborage, maintaining a 3-foot gravel or stone barrier around houses, sealing all openings larger than 1/4 inch, and monitoring rodent activity and documenting control measures.
Wild bird control includes keeping feed storage areas enclosed, cleaning up spilled feed promptly, repairing holes in house curtains and sidewalls, using bird netting over inlets and vents where practical, and maintaining doors and screens.
Cleaning and Disinfection Between Flocks
All-in all-out flock management means the entire house is emptied, cleaned, and disinfected before the next flock arrives. The between-flock cleaning process includes dry cleaning to remove all visible organic matter from surfaces, equipment, and floors, washing with detergent and water using a pressure washer, applying disinfectant to all surfaces after washing and drying, and allowing appropriate downtime — typically 14–21 days — before the next placement.
The effectiveness of disinfection depends entirely on the quality of cleaning. Organic matter inactivates most disinfectants, so cleaning must remove all visible manure, dust, and debris before disinfectant is applied. Disinfectant selection should match the target pathogens and follow manufacturer instructions for concentration, contact time, and application method.
Biosecurity Documentation
Biosecurity records serve two purposes: they prove compliance during audits and they help growers identify gaps in their protocols. Daily biosecurity checks should include verifying footbaths are charged and active, confirming that house-specific footwear is being used, logging all visitor entries and vehicle movements, and documenting any biosecurity incidents or corrective actions.
Growers who maintain organized biosecurity records can demonstrate compliance during integrator and third-party audits. Records also help identify recurring problems — if the same house consistently shows footbath issues, that house may need a different footbath design or more training for workers.