Fig. 1

Effect of fetal and placental weight on fetal serum glucose. Both fetal weight and placental weight affected fetal serum glucose concentrations, with no effect of glucosamine supplementation (glucose = 2.06–0.00072(fetal weight) + 0.002401(pwt); P < 0.05 for both effects). The white line indicates where the effects of fetal and placenta weights on glucose balance, yielding no change in glucose concentrations. This occurs at a ratio of placental weight to fetal weight of 0.30. Means with number of observations are included at positions within the surface plot to reflect how well the surface plot corresponds with the actual observations