INS and fetal growth restriction: Plasma insulin concentrations and body weight‐specific net glucose utilization rates used to generate the dose–response curves were not different between control (Vmax 68 ± 3 μmol min−1 kg−1, Km 1.3 ± 0.2 μg l−1) and IUGR lambs (Vmax 63 ± 3, Km 0.9 ± 0.2) at any infusion rate, and these two groups were combined to analyse this relationship.