Answer :
Final answer:
The swine producer should vaccinate against Erysipelas to address the symptoms observed in the piglets.
Explanation:
Erysipelas is the disease the swine producer should vaccinate against when noticing piglets walking stiffly and having red blotches on their skin. Erysipelas is a bacterial infection caused by Erysipelothrix rhusiopathiae and can lead to various symptoms in pigs, including skin lesions and lameness.
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