Figure 1.

Mean contractile responses of (A) umbilical artery and (B) uterine artery to increasing concentrations of norepinephrine using vessels collected from ewes (n = 7/ treatment) that had been fed endophyte-infected (E+) or endophyte-free (E–) tall fescue seed from day 35 to day 133 of pregnancy (E+/E+; E–/E–) or had the treatment switched on day 86 (E+/E–; E–/E+). Seed treatment × norepinephrine concentration was significant for umbilical artery (P = 0.02), but not for uterine artery (P = 0.94). There was a tendency for an effect of seed treatment for uterine artery (P = 0.07).