Ovarian superstimulation treatment for multiple ovulation and embryo transfer programs in sheep

Superovulation in sheep aims to provide hormonal preparations to stimulate growth and ovulation of a higher number of preovulatory follicles. It is a decisive step in ewes multiple ovulation and embryo transfer, although still has results with high variability. Several studies have been performed to obtain a homogeneous and satisfactory answer to this biotechnology, although a better understanding of this phenomena is still required, taking into account the estrous cycle, physiological hormonal regulation and biological phenomenon of follicular dynamics. Considering the importance of superovulation in MOET technique in sheep, this review aims to approach the key aspects of this event in ewes (reproductive physiological phenomena and treatment of superovulation).