Cytokine levels in colostrum and in foals’ serum pre- and post-suckling.

This research study is about identifying the presence and analysing the absorption of certain cytokine (IL-4, IL-8, IL-13, and IFN-γ) levels in horse colostrum and foals’ serum, both at their birth and 24 hours after birth. It suggests that IL-4 can be absorbed from colostrum, and the presence of IL-8 in foal’s serum before suckling might be due to the newborn’s own production.

Research Methodology

• The research was conducted using samples from 14 mares and their healthy foals.
• From each mare, 10ml of colostrum was collected immediately after they gave birth. The samples were filtered, centrifuged, and preserved under freezing conditions until they were assayed.
• The foals provided blood samples at birth (T0) as well as at 24 hours after birth (T24). These samples were also frozen until assayed.
• The researchers chose to assay serum immunoglobulin G (IgG) at the 24-hour mark using an immunoturbidimetric quantitative method.
• The cytokine content in the samples was examined using commercially available Enzyme-Linked Immunosorbent Assay (ELISA) tests.

Research Findings

• The statistical analysis demonstrated a significant difference between serum concentration of IL-4 at birth and at 24 hours after birth. There was a significant correlation between IL-4 in the serum at T24 and colostral IL-4, which implies that the IL-4 is absorbed from the colostrum.
• The presence of cytokine IL-8 in the foal’s serum before suckling could be a result of the foal’s own endogenous production. Endogenous refers to those substances which are made within and by the body itself.
• Another cytokine, IL-13, was absent in most foals’ serum both at birth and 24 hours after birth (in 8 of the 14 samples). This cytokine showed wide concentration range and high standard deviation in four colostrum samples where it wasn’t detected at all, indicating an unpredictable occurrence and distribution.
• The cytokine IFN-γ was present in both the mare’s colostrum and the newborn foals’ serum at birth, hinting its potential transmission from mother to foal.