Multivalent inactivated virus oil emulsion vaccines in broiler breeder chickens. III. Trivalent Newcastle disease, infectious bursal disease, and arthritis/tenosynovitis viruses vaccine in primed breeders.

Inactivated Newcastle disease (NDV), infectious bursal disease (IBDV), and viral arthritis/tenosynovitis (VA) viruses were incorporated into water-in-oil emulsion vaccines, either alone, in bivalent combinations, or in a trivalent vaccine. Twenty-week-old broiler breeder chickens that had received previous live virus vaccination with NDV, IBDV, and VA were injected intramuscularly with the monovalent, bivalent, or trivalent vaccines. The antibody titers to the antigens contained in the monovalent, bivalent, or trivalent vaccines increased rapidly and peaked 4 to 8 weeks postvaccination. The titers declined during the next 3 months and increased to levels equal to or higher than the initial peak values. The titers remained high through 10 months postvaccination. Progeny hatched at intervals throughout the 40-week trial possessed detectable antibody titers to the appropriate antigens incorporated into the breeder vaccine through 21 days of age.