2.6 Data analysis
The percentage (with 95% CI) of the results was calculated. Based on
age, cows were divided into three age groups: 1–5 years, 6–10 years,
and > 10 years. Fisher’s exact test was used to compare the
age and pregnancy status of the cows with neutralising antibodies. The
correlation between antibodies analysed and age was evaluated via
Pearson correlation analysis using GraphPad Software InStat 3, (San
Diego, CA). P values less than 0.05 were considered statistically
significant.