[Postcolostral immunoglobulin G (IgG) levels in newborn piglets using three different ELISA detection systems]

Area of Science:

• Veterinary immunology
• Neonatal animal health
• Diagnostic test evaluation

Background:

• Accurate assessment of immunoglobulin G (IgG) levels in newborn piglets is crucial for passive immunity and survival.
• Established enzyme-linked immunosorbent assay (ELISA) methods provide reliable IgG quantification but can be time-consuming.
• A need exists for a rapid, user-friendly test to evaluate IgG status in large piglet populations.

Purpose of the Study:

• To evaluate the Colostrum Quality Counter (CQC) for its ease of handling and comparability to standard IgG testing methods.
• To assess the reliability and consistency of CQC results for determining immunoglobulin G concentrations in neonatal piglets.
• To determine if the blood collection site impacts IgG measurement accuracy using different testing regimes.

Main Methods:

• Blood samples from 219 piglets across four farms were analyzed for IgG concentrations using three distinct ELISA tests: CQC, laboratory internal IgG-ELISA (MUC), and a commercial IgG-ELISA (NAT).
• Paired blood samples from 30 piglets were collected from both the anterior vena cava and tail to assess the effect of sampling site on IgG levels.
• Statistical analysis was performed to compare the correlation and variability of results obtained from the different testing methods and sampling locations.

Main Results:

• The internal laboratory IgG-ELISA (MUC) and the commercial IgG-ELISA (NAT) demonstrated a higher correlation with each other compared to the Colostrum Quality Counter (CQC) for individual piglet results.
• Results generated by the CQC exhibited higher mean values and a significantly greater standard deviation, indicating increased variability.
• No significant difference in measured IgG concentrations was observed based on the blood sampling site (anterior vena cava vs. tail).

Conclusions:

• The Colostrum Quality Counter (CQC) offers a straightforward and convenient method for assessing immunoglobulin G (IgG) levels in a large number of newborn piglets.
• However, CQC test results presented inhomogeneity, with some exceptionally high IgG concentrations noted.
• The established MUC and NAT IgG-ELISA methods yielded comparable results to each other, showing good correlation, suggesting they remain reliable for accurate IgG quantification.