Experimental study on the protection of chickens and pheasants against syngamosis by use of irradiated larvae: methods for immunization, preparation of immunizing material and identification of serum antibodies by immunofluorescence

agriculteur agricultores antibodies anticorps anticuerpos chickens enfermedades parasitarias farmers immune serum immunisation immunization immunserum infecciones por nematodos irradiation larvae larvas larve methode methods nematode infections optical properties parasitose parasitoses pollo poulet suero inmune syngamus