The impact of PCV2 viremia in a high health Canadian swine herd, a vaccination trial comparing two commercial vaccines

摘要

Subclinical infections with PCV2 are common and can occur in the absence of co-factors or if vaccination does not prevent viral replication. PCV2 viremia produces immune system activation which causes the redirection of nutrients intended for growth to counteract disease challenge. The objective of this field trial was to compare the productivity of nursery and grower-finisher (G-F) pigs vaccinated with a labeled dose of one of two commercial circovirus vaccines or a placebo. Productivity was measured as average daily gain (ADG) and mortality.