Antibody response to Newcastle disease vaccination in a flock of young houbara bustards (Chlamydotis undulata).

: Twelve young houbara bustards (Chlamydotis undulata) were vaccinated with a lentogenic strain of Newcastle disease virus. Another seven birds were kept in close contact with the treated flock but were not vaccinated. Antibody levels were measured in all birds with hemagglutination inhibition test over the course of 1 yr. Antibody formation with no side effects was observed in 18 birds. The duration and amplitude of the antibody response differed between the groups.