In fact, increased uterine vascular resistance and reduced uterine blood flow can be used as predictors of high-risk pregnancies and are associated with fetal growth retardation (Trudinger et al. 1985; Northet al. 1994). Thus, the impact of factors that influence placental vascular development and function on fetal growth and development is striking (Reynolds & Redmer, 1995; Reynoldset al.2005a). Moreover, observations in humans and livestock indicate that compromised fetal growth impacts not only the neonate but also health and productivity throughout life (Barker & Clark, 1997; Breieret al.2001).