Which practice is primarily about preventing disease spread?

• A. Vaccination
• B. Breeding strategies
• C. Nutrition optimization
• D. Biosecurity

Answer: (D)

Preventing disease spread hinges on stopping pathogens from moving onto the farm and between animals. Biosecurity is the practice that targets these transmission pathways: quarantining new arrivals, isolating sick animals, cleaning and disinfecting equipment, controlling visitor access, managing wildlife and pests, and proper sanitation. By cutting opportunities for infections to enter and spread, biosecurity directly reduces disease transmission within the herd.

Vaccination builds immunity and reduces the impact of disease, but it doesn't by itself prevent the spread through the environment. Breeding strategies and nutrition help overall health and resilience but aren't primarily about limiting transmission between animals. So, the measures designed to stop disease from moving around a farm are what biosecurity focuses on.