Temporal changes in leukocytes infiltration in the guinea-pig interpubic joint along pregnancy (P), immediately after parturition (iAP), and postpartum (PP). Bars represent mean values of volume density (area fraction occupied by leukocytes; Vv, ± SD) of five animals/group. Highest Vv values of eosinophils were recorded before parturition (D63), whereas neutrophils and mononuclear cells reached their highest values one day after parturition (D1). Infiltration was absent in nonpregnant (NP) tissue samples. Means with different letters differ significantly (p < 0.05).