ColostrumMothersMilkPregnancyImmunity, Maternally-AcquiredMilk, HumanMilk SubstitutesAnimals, NewbornLactationCattleAnimals, SucklingInfant, NewbornImmunoglobulin A, SecretoryMother-Child RelationsBreast FeedingSwineAnimal Nutritional Physiological PhenomenaMaternal-Fetal ExchangeLactoglobulinsImmunoglobulin GInfectious Disease Transmission, VerticalLactoferrinParturitionImmunoglobulin A