Effect of subclinical lead toxicity on the immune response of chickens to Newcastle disease virus vaccine

antibodies anticorps anticuerpos aves de corral bazo bolsa de fabricio bourse de fabricius bursa fabricii chickens immune response lead linfocitos lymphocyte lymphocytes mortalidad mortalite mortality newcastle disease virus plomb plomo pollo poulet poultry rate spleen thymus (genre) thymus (genus) toxicidad toxicity vaccin vaccines vacuna virus de la enfermedad de newcastle virus maladie de newcastle volaille