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Humoral immune response of broilers fed diets containing yeast extract and prebiotics in the prestarter phase and raised at different temperatures

V. K. Silva^*,1, J. Della Torre da Silva^*, K. A. A. Torres^*, D. E. de Faria Filho, F. Hirota Hada^* and V. M. Barbosa de Moraes^*

^* Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias, UNESP, via de Acesso Prof. Paulo Donato Catellane, s/n CEP 14.884-900, Jaboticabal, São Paulo, Brazil; and Departamento de Zootecnia, Instituto de Ciências Agrárias, UFMG, CEP 39.404-406, Montes Claros, Minas Gerais, Brazil

¹ Corresponding author: vanksilva{at}yahoo.com

Feedstuffs and additives with immunomodulatory characteristics were investigated to reduce losses caused by disease and to optimize the production potential of the bird. Therefore, the objective of this study was to assess the influence of yeast extract and prebiotics on broilers fed a prestarter diet, and the impact of ambient temperature on maternal and postvaccinal humoral immune responses. The birds were fed diets supplemented with yeast extract, prebiotics, or both in the prestarter phase (1 to 7 d), and from d 8 on, all birds received the same diet. The birds were vaccinated against Newcastle disease virus and infectious bursal disease at 8 and 18 d of age. The addition of yeast extract and prebiotic in the prestarter phase did not change the humoral immune response against Newcastle disease virus or infectious bursal disease throughout the production cycle of the broilers. The higher temperature increased IgG levels, especially maternal antibody titers, despite the immunomodulating effect of heat stress until the second week of life.

Key Words: heat stress • infectious bursal disease • Newcastle disease • mannan oligosaccharide • Saccharomyces cerevisiae