ImmunocompetenceComb and WattlesTenebrioParrotsPhytohemagglutininsSongbirdsAntibody FormationGalliformesImmunity, CellularParasitic Diseases, AnimalFinchesSexual Behavior, AnimalParasitesBody Weights and MeasuresParasitic DiseasesImmunityLymphocytesImmune SystemBirdsThymectomySkin TestsGraft vs Host ReactionImmunosuppressionSpleenLymphocyte ActivationTestosteroneT-LymphocytesThymus GlandImmune ToleranceHypersensitivity, DelayedSex CharacteristicsErythrocytesLeukocyte CountCarotenoidsEnvironmentLectinsImmunity, InnateTransplantation, HomologousSheepBone Marrow TransplantationAntigensLeukocytesBody WeightImmunoglobulin G