2017-09-192017-09-191988-12ANDRADE, Maria Auxiliadora. Fatores que influenciam na vacinação de newcastle em pintos de linhagem comercial. i - influência de anticorpos maternos. Anais da Escola de Agronomia e Veterinária, Goiânia, v. 18, n. 1, p. 97-107, jan./dez. 1988. Disponível em: <https://www.revistas.ufg.br/pat/article/view/2554/2526>.0100-218Xhttp://repositorio.bc.ufg.br/handle/ri/12506ln order to evaluate the protection of passive antibodies of Newcastle disease, chicks of commercial line from three distincts incubators commercialized in the city of Goiania were submited to four types of treatment. The first group was vaccinated in the first day of Iife, the second on the seventh day of life, the third, in the fourteenth and the group not vaccinated (control). The chicks received ocular via 0,03 mi of Lasota against the Newcastle disease. Toe irnmunologic answer was evaluated through the Hemagglutination -Inhibition tests and total protection tests, challenging from the first through the forty-second day, with intermission of a week. Tbe sorological results of maternal antibodies showed that the eomelric mean HI titres (expressed in log2) decrease strongly from the first to the third week, tbe sarne happened with the challenge tests, with 98% of protection on the first days of Iife, with average percentage of 26% on the third week. It was verified, within the experiment conditions, when its established a single vaccination, lhe ideal age is around fourteen days; though the average of mortality in this group during ali phases of the experiment was 22,86% was not possible to obtain the percentage levei of total protection.porAcesso AbertoArtigo