Feeding different levels of vitamin E and selenium has no effect on serum immunoglobulin Y (IgY) production by layers vaccinated against Escherichia coli and avian encephalomyelitis virus

Ciência Rural

Giselle Kindlein²  Andréa Machado Leal Ribeiro¹  Cláudio Wageck Canal¹  Maitê De Moraes Vieira² 

[1] ,Universidade Federal do Rio Grande do SulPorto Alegre RS ,Brasil

关键词: avian encephalomyelitis;    Escherichia coli;    immunoglobulin;    selenium;    vitamin E;    encefalomielite aviária;    Escherichia coli;    imunoglobulina;    selênio;    vitamina E;   

DOI  :  10.1590/S0103-84782007000500024

来源: SciELO

【 摘 要 】

The effects of vitamin E and selenium (Se) supplementation on the immunity of hens vaccinated against a mixture of six swine-pathogenic Escherichia coli (EC) and avian encephalomyelitis virus (AEV) were studied. Antibody production (AbP) was evaluated in ninety 49 to 57-week-old H&N Nick Chick hens fed diets containing 14IU Vitamin E kg-1 (basal diet), 27, 59, 111, or 111IU vitamin E kg-1 + 0.56ppm Se supplementation. At 51 wks of age, half of the hens were vaccinated against EC, and all birds were vaccinated against AEV. At 53-weeks of age, the birds received a second dose of EC vaccine. Blood samples were collected weekly and serum was analyzed by ELISA for anti-EC IgY and was expressed as optical density (OD). Vaccinated hens had higher serum OD than the non-vaccinated hens (P£0.05). Vaccinated hens fed 27 and 59IU of vitamin E/kg had a higher (P<0.05) serum OD than hens fed 111IU + Se. Neither EC nor AEV seem to be appropriate models for the study of the influence of micronutrients on immune responsiveness of older hens.

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