ColostrumMilkImmune SystemMilk, HumanImmunity, Maternally-AcquiredMilk SubstitutesAnimals, NewbornCattleImmunoglobulin A, SecretoryLactationPregnancyImmunoglobulin GAnimals, SucklingImmune ToleranceSwineImmunoglobulin AAnimal Nutritional Physiological PhenomenaImmunity, InnateImmunization, PassiveImmune SeraLactoglobulinsLactoferrinImmunoglobulinsImmune EvasionImmunityAntigen-Antibody Complex