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Average daily weight gain rate of piglets from vaccinated (Gv) and unvaccinated (Gc) sows after challenge through 17 dpc. Due to no piglets surviving after 9 dpc in the Gc group, daily weight gain could not be determined. Error bars represent standard deviations. P values were calculated by comparing Gv and Gc groups using the Mann-Whitney U test. *, P = 0.001 to 0.05; †, P < 0.001.
