Abstract
Two experiments were conducted to demonstrate the efficacy of a commercial foot-and-mouth disease (FMD) vaccine in pigs born to well-vaccinated sows at various ages with a single injection under field conditions. The first experiment showed that single dose vaccination of pigs could be conducted at an age younger than 10 weeks. Second experiment demonstrated that pigs vaccinated once at the age of 8 weeks had mean serum neutralization (SN) titer of 1.89±0.95 log 10 SN 50 with full protection by challenge test at the age of 24 weeks. Results indicate that the most appropriate age for single dose FMD vaccination in pigs born to well-vaccinated sows would be at 8 weeks.
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