Lyophilized hyperimmune equine serum as a source of antibodies for neonatal foals.

The research article presents a study that investigated the effectiveness of lyophilized hyperimmune equine serum in providing immunity to newborn foals. The study found no significant difference in the absorption of immunoglobulin G (IgG) and specific viral antibodies from lyophilized serum when compared to colostrum, suggesting its potential use in boosting passive immunity in neonatal foals.

Objective of the Study

• The main objective of this research was to evaluate the potential use of colostrum, lyophilized serum, and a mixture of both as sources of antibodies to provide passive immunity for neonatal foals.

Methodology

• Fifteen newborn foals, divided into three groups of five, participated in the study.
• The foals in the first group were fed 250 ml of colostrum within four hours of birth.
• The second group received 250 ml of lyophilized serum reconstituted at five times its original concentration.
• The third group was given a 1:1 mixture of colostrum and lyophilized serum.
• The concentration of IgG and the presence of anti-equine rhinovirus 1 and anti-equine influenza A1 and A2 antibodies in each foal’s serum was tested at 0 and 24 hours after birth.

Findings of the Study

• The study found that there were no IgG or specific viral antibodies in the samples taken at birth, with the exception of a single foal that had suckled its dam prior to the experiment.
• The researchers did not identify any significant differences in serum IgG concentrations and viral antibody titers among the three groups of foals.
• The study suggests that IgG is absorbed efficiently from both colostrum and serum.

Conclusions and Implications

• The use of lyophilized serum as a prophylactic measure to confer passive immunity to newborn foals is a promising proposition based on the study’s results.
• The efficient absorption of antibodies from serum indicates that it can potentially supplement or replace colostrum in providing immunity to neonatal foals, particularly in cases where colostrum is not available or insufficient.