Biological monitoring of vaccine take and productive parameters in broilers vaccinated with immune complex and recombinant vector vaccines against Infectious Bursal Disease (IBD)
Luiz Sesti, Carlos Kneipp, Yannick Gardin, Branko Alva
A live Immune Complex vaccine (Cevac Transmune) and a recombinant vector vaccine were compared for their biological characteristics of vaccine “take” and productive parameters from vaccinated broilers. Two (2) controlled field trials in low IBDV field challenge farms were carried out to monitor the biological characteristics of vaccine “take” between 35 and 42 days of age (IBD serology / Bursa of Fabricius [BF] weight / lymphoid depletion / BF viral colonization by molecular techniques). In addition, productive parameters of broilers vaccinated with both vaccines were also compared (average slaughter weight, feed conversion, total mortality, daily weight gain).
Vaccines were applied via subcutaneous route at 1 day of age. Cevac Transmune vaccine induced a significantly more uniform expected biological characteristics of vaccine “take” as well as a trend for better productivity parameters than the recombinant vector vaccine.
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