Ovarian superstimulation protocols modulate the morphological phenotypes in bovine oviduct.

It has been shown that estradiol (E2) and progesterone (P4) have a significant influence on the alteration of morphological parameters in the oviduct of cattle. These morphological changes were demonstrated by comparing the effects of the different hormonal profiles between the hormonal phases of the estrous cycle or between the ipsi- and contralateral side of the preovulatory follicle/corpus luteum and even the size of the corpus luteum. In our previous study, we have shown that the ovarian superstimulation (OVS) protocol increases E2 levels in the bovine oviduct during the preovulatory phase.