Figure 3.

Mean contractile responses of (A) umbilical artery and (B) uterine artery to increasing concentrations of ergotamine 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+). There was not a seed treatment × ergotamine concentration interaction for umbilical artery (P = 0.14), nor was there a seed treatment effect (P = 0.19), but the effect of ergotamine concentration was significant (P < 0.01). For the uterine artery, the interaction was significant (P < 0.01).