Animals, SucklingGuinea PigsLactationSucking BehaviorAnimal Population GroupsWeaningMilk EjectionSwineMilkAnimals, NewbornSwine DiseasesColostrumPregnancyPostpartum PeriodOxytocinIntestine, SmallAnimal FeedBody WeightAnimal Nutritional Physiological PhenomenaRandom AllocationAnimal HusbandryImmunity, Maternally-AcquiredIleumIntestinesWeight GainProlactinSus scrofaLactaseCattleLitter SizeEnterotoxinsDisaccharidasesKetone BodiesReoviridae InfectionsAgingLiverJejunumDiarrheaRats, Inbred StrainsSwine, MiniatureMammary Glands, AnimalTime FactorsDietAnovulationEstrusOrgan SizeLuteinizing HormoneTrichinellaIntestinal MucosaMaternal BehaviorPneumonia of Swine, MycoplasmalRotavirusLactoseRotavirus InfectionsSucraseEatingAnestrusFecesSheepParturitionMaternal-Fetal ExchangeIntestinal AbsorptionGerm-Free LifeMicrovilliRelaxinBiological AssayVirulenceOvulationBreast FeedingDigestionMycoplasma hyopneumoniaeDairyingProgesteroneDietary SupplementsHousing, AnimalRNA, MessengerPregnancy, AnimalNutrition Disorders