What vaccination is typically administered when lambs start on a high concentrate feed?

When lambs transition to a high concentrate feed diet, they are at an increased risk for enterotoxemia, a condition caused by the overgrowth of Clostridium perfringens type D in the intestines. This pathogenic bacteria produces toxins that can lead to severe gastrointestinal disturbances and even death in lambs.

Administering the enterotoxemia vaccine helps prevent this disease by stimulating the lamb's immune system to produce antibodies against the toxins released by the bacteria. The vaccination is typically given before or at the time when the lambs start consuming a high-energy diet to ensure that they have protective immunity as they change their feeding regimen.

The other vaccination choices do not specifically address the risks associated with high concentrate feeding in lambs. For instance, the CDT vaccine provides protection against clostridial diseases and tetanus, but it does not specifically target enterotoxemia, which is crucial during dietary transitions. The Brucellosis vaccine is aimed at preventing brucellosis in cattle, which is not relevant to lambs, and the Rabies vaccine is not typically administered in sheep, as rabies is not a common concern in this species. Therefore, the enterotoxemia vaccine is the appropriate choice for lambs starting