Here's why:
* Passive immunity: Calves receive some protection from blackleg through colostrum (first milk) from their mothers. However, this passive immunity wanes quickly, and they become susceptible to the disease.
* Active immunity: Vaccinating calves early ensures they develop active immunity before they are fully vulnerable. This is crucial as blackleg can be fatal, and calves are most susceptible during the first few weeks of life.
* Timing: Vaccinating calves within the first two days of life maximizes the effectiveness of the vaccine and provides long-lasting protection.
Important Note: Consult with your veterinarian for specific guidance on the best vaccination schedule for your calves. They can consider factors like your herd's history of blackleg, the type of vaccine available, and the overall health of your calves.