Figure 4From: Aromatase inhibitor treatment with an intravaginal device and its effect on pre-ovulatory ovarian follicles in a bovine modelPlasma estradiol concentrations (mean ± SEM). Heifers were treated with a blank (control, n=15) or a letrozole-containing intravaginal device (letrozole, n=15). Devices were given on Day 1 of the ovulatory wave (indicated by the arrow; Day 0 = wave emergence).Back to article page