Effect of withholding macromolecules on the duration of intestinal permeability to colostral IgG in foals.

This research examines the impact of delayed feeding on the absorbance of colostrum, specifically the immune protein IgG, in newborn foals. The findings show that giving foals colostrum within the first 12 hours of life ensures better absorption of IgG, regardless of the type of fluid first administered to the foal.

Study Overview

• The study aimed to understand the absorption of colostrum, particularly the immunoglobulin protein IgG, in newborn foals. It also tested the hypothesis that delaying ingestion of larger molecules may extend the time during which the intestines can absorb these proteins.

Methodology

• The research involved thirteen neonatal foals of mixed breeds.
• The foals were divided into two experimental groups. One group was fed a glucose-electrolyte solution, and the other a commercial milk substitute for twelve hours after birth. Following this, both groups were given known amounts of colostrum that had IgG.
• A control group was also established, whose foals received colostrum right after birth.
• The absorption efficiency of the IgG was calculated based on the plasma IgG concentration for each foal.

Results

• About 51% of the ingested IgG was transferred into the blood circulation in those foals given colostrum immediately after birth.
• Delaying colostrum feeding significantly reduced the amount of IgG absorbed by the foals. However, withholding larger molecules for 12 hours did not affect subsequent IgG absorption efficiency.

Conclusions

• For best absorption of IgG, foals should be given colostrum within the first 12 hours of their lives.
• The intestinal absorption capacity for IgG wasn’t influenced by the type of fluid initially given to the foals before they received colostrum. This suggests that gut closure, which is the process where the intestines stop absorbing large molecules like proteins from the diet, doesn’t depend on limiting initial macromolecular uptake capacity.