The capacity of the digestive tract to absorb intact proteins must not last beyond one or two weeks, since once foods other than milk are ingested the proteins and other antigens in them would also be absorbed intact and could act as immunogens to which the growing animal would become allergic (see immune system disorder: Allergies).
It has been suggested that such residues may impose a selection pressure on the calf's intestinal microbiota if waste milk is ingested by the calf.
The infants' weights before and after feeding were also recorded, in order to ascertain that a substantial amount of milk was ingested before measuring postprandial insulin concentrations.
Our original hypothesis was that weight gain was being stimulated by a failure to downregulate energy intake from solids when large amounts of bottle milk were being ingested.
During viraemia, the virus is excreted in milk and can be ingested orally by consumption of non-pasteurized milk or cheese produced from raw milk [ 22- 25].
As a milk protein, OPN is ingested and processed through the intestinal system, and it is unknown whether this OPN derived from ingested milk can affect the immune status of the organism or even the development of tumours.
Lead from current maternal exposure, as well as that accumulated in bone from past environmental exposures and subsequently released into blood, is excreted into breast milk and thus may be ingested by the nursing infant.
A study at Texas Tech University, published 1 April 2005 in Environmental Science & Technology, found that perchlorate levels in 36 samples of breast milk from nursing mothers in 18 states averaged 10.5 ppb, meaning the mothers were ingesting far more than 24 ppb.
Macrophages were ingesting multiple apoptotic bodies.
These molecules also are secreted into the mother's milk and, once they have been ingested by an infant, can be transported into the blood, where they confer immunity.
