EFEITO DA VACINAÇÃO SPRAY CONTRA Eschrichia coliNO PINTAINHO DE UM DIA DE IDADE SOBRE O DESEMPENHO E CONDENAÇÕES DE CARCAÇAS

Abstract

Avian colibacillosis is a relevant disease in poultry farming worldwide as it is related to significant economic losses, high treatment costs and impact on the condemnation of carcasses in slaughterhouses. The objective is to evaluate the occurrence, manifestation and impacts of colibacillosis in broiler chickens using a modified live vaccine, made with a strain of Escherichia coli (E. Coli) that improves performance. 30,000 broiler chicks of the Ross lineage were housed per aviary for a period of one to 42 days and managed appropriately in accordance with the lineage manual, through the adaptation of drinkers and feeders suitable for the breeding phase, totaling 4 aviaries per nucleus, with 150 m long × 16 m wide × 14 m high each. The experiment was carried out in a randomized block design (DBC), where the nucleus was the block and the aviaries were the experimental unit (two control aviaries x two test aviaries). The control treatment consisted of birds that did not receive the Escherichia coli vaccine while the test treatment consisted of birds that received the Escherichia coli vaccine via spray in the hatchery. It was observed that there was a significant effect on mortality and total carcass condemnation due to the appearance of Aerosacculitis. It was concluded that the use of the spray vaccine in one-day-old chicks can reduce the incidence of carcass condemnations, mainly due to arthritis, and that the performance parameters meet the expectations recommended by the lineage.