Efficacy of live La Sota Newcastle disease vaccine simultaneously vaccinated with various types of inactivated vaccine

Pakpinyo, S.; Sasipreeyajan, J.

Thai Journal of Veterinary Medicine 23(1): 35-47

1993


ISSN/ISBN: 0125-6491
Accession: 002367668

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Abstract
In an experiment using 105, ten-day-old broiler chickens divided into five groups of 21 birds, group 1 were unvaccinated control, group 2 were vaccinated with live La Sota vaccine, group 3 were vaccinated with live La Sota and inactivated La Sota vaccine, group 4 were vaccinated with live La Sota and commercial inactivated vaccine, group 5 were vaccinated with live La Sota and inactivated local vaccine. Blood samples were collected and sera were tested for Newcastle disease antibody at 1, 10, 28, 35 and 49-day-old by haemagglutination inhibition (HI) test. All birds were challenged at 35-day-old. Mortality rate, body weight gain, feed conversion rates and mean HI titres were compared after the challenge. Results revealed that there was no resistance in group 1 while in groups 2, 3, 4 and 5 were 100, 95.2, 95.2 and 100% protected respectively. In addition, body weight gain, feed conversion rates and mean HI titres of group 5 were higher than those of groups 4, 2 and 3.