Fig. 1

PCV-2 IgG OD results (mean ± SD) form sows’ serum samples of the four experimental groups. V PM: vaccinated pre-mating; V MG: vaccinated at mid gestation; V LG: vaccinated at late gestation; NV: non-vaccinated. Different letters indicate statistically significant differences (p ≤ 0.05) among experimental groups for a given sampling point