A pilot study to investigate the measurement of immunoglobulin A in Welsh Cob and Welsh Pony foals’ faeces and their dam’s milk.

The research paper is about a pilot study which investigated the measurement of immunoglobulin A (IgA) in faeces of Welsh Cob and Welsh Pony foals and the milk of their mothers, using an ELISA designed for measuring IgA in equine serum, to determine links between the concentrations.

Sample Collection and ELISA Testing

• The paper discusses a test conducted on faeces from 20 Welsh Cob and Welsh Pony foals along with milk from their dams (mothers). These samples were collected within 12 hours (Day 0) and at 6 days after parturition (Day 6).
• Due to certain constraints, faeces could not be collected from 2 out of the 20 foals and milk samples could not be collected from 3 out of the 20 mares on the 6th day.
• All samples collected were tested for concentrations of IgA using an equine IgA ELISA. This type of ELISA, meant for the measurement of IgA in equine serum, was validated for serum and plasma. The tests were performed three times on all samples.

Findings from the Research

• On Day 0, seven out of the twenty faecal samples showed non-detectable levels of IgA. Similarly, two out of eighteen faecal samples taken on Day 6 didn’t show any trace of IgA.
• For samples with detectable IgA, the modified CV for Day 0 faecal samples averaged around 10.5 (95% confidence interval [CI] = 6.0-15.0)%. On the contrast, Day 6 faecal samples averaged around a lower 6.8 (95% CI = 4.3-9.4)%.
• The median concentrations of IgA on Day 6 was significantly higher than that of Day 0. The findings showed a noticeable increase from 0.7 mg/g to 37 mg/g dry matter (p = 0.003).
• There was a statistical correlation between the concentrations of IgA in milk and the concentrations of IgA in faeces on Day 6. The correlation coefficient was 0.59 (p = 0.006).

Conclusions

• The study concluded that the IgA ELISA demonstrated acceptable precision for estimating concentrations of IgA in foal faeces during the first week of life. Despite this, IgA could not be detected in 37% of meconium samples collected on Day 0.
• The ELISA test could prove useful for researching the role maternal milk IgA plays in the gastrointestinal tract of neonatal foals, but the study also recommended further assessment of both accuracy and precision of the ELISA.