| Summary |
A 3-year serological survey on antibodies against Newcastle disease (ND), infectious bursal disease (IBD). chronic respiratory disease (CR])), and pullounn disease (PD) in chicken breeder flocks in Taiwan was conducted began in Feb. 1990. A total of 2602 breeder chickkens from 18 breeder flocks were surveyed during Feb. — March, 1990. In Nov. —Dcc, 1990, a total of 2227 breederchickens from 13 breeder flocks were investigated During Nov. —Dcc, 1991. a total of 1560 breeder chickens from 12 breeder flocks were tested. It was found that 66.2% of the breeders surveyed in Feb. March, 1990 had a ND hemagglutination-inhibition antibody titer at 1:32 or higher. In Nov. Dec., 1991 and Nov. Dec., 1992 the percentage was 82.1% and 100?”o, respectively. The breeders had an IBD virus neutralization titer at 1250 or higher were 61.8% of the total chickens surveyed in Feb. March 1990. It was 32.2% adn 32.7% in Nov. Dec., 1990 and Nov. Dec., 1991 respectively. The total positive rate of plate ag1utination antibody against CRD was 52.7% in Feb.-March, 1990. The positive rate inNov.-Dec., 1991 andNov.-Dec.. 1992 was 81.6% and 79%, respectively. Among the 18 flocks surveyed, two flocks were CR1) antibody- negative flocks inn Feb.-March.. 1990. In Nov.-Dec., 1990, all the 13 breeder flocks survered were CR]) antibody positive. The total positive rate of plate agglutination antibody against PD was 4.2% in Feb.-March., 1990. Seven out of 18 breeder flocks survered wwere PD antibody positive. In Nov.-Dec., 1991, eleven out of 13 breeder flocks surveyed were PD antibody positive, and the total positive rate was 2.9%. In Nov.-Dec., 1992. nine out of 12 breeder flocks surveyed were PD antibody positive, and the total positive rate was 2.0%. Serological SurveyFNewcast1e Disease FInfectious Burs al
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