Pig-to-pig transmission accounts for 90 percent of the disease problems that Brian Caldwell, a Wells, Minn., swine practitioner, sees.

Biosecurity is probably the most effective method to prevent disease. And prevention is easier than curing a disease, says Caldwell.

The most common types of pig-to-pig transmission occur from:

  • Breeding stock.
  • Finishing pigs.
  • Internal multiplication programs.
  • Immune status variations over time.
  • Health variations within pig groups.


Other sources of disease introduction, besides pig-to-pig transmissions, include manure transmissions, aerosol transmissions and other vectors.

Understanding and considering these factors are important as you design and implement a biosecurity program for your herd.