Fig. 1From: Associations between maternal vitamin D status and porcine litter characteristics throughout gestationQuantification of maternal total 25(OH)D in maternal plasma on days 18, 30, 45, 60, and 90 of pregnancy. Mean values presented. Error bars represent S.E.M. Different letters indicate that group means differ from one another. n = 5–11 gilts per gestational dayBack to article page