What must be done to swine before they enter California?

Swine entering California are required to undergo a quarantine process to prevent the spread of diseases that can affect both livestock and potentially humans. Quarantining at the destination for 30-60 days helps to ensure that any diseases present are identified and managed before the animals are integrated into the local population. This period allows for monitoring, veterinary evaluation, and compliance with any state regulations designed to protect animal health and biosecurity.

The other options do not align with the specific health and safety regulations for swine entering California. Feeding swine exclusively organic feed or administering a special vaccine may sometimes be relevant to specific health management practices but do not pertain to the mandatory actions required before swine can enter the state. Additionally, there is no generalized regulation that swine must not be older than 6 months as a requirement for entry into California.