The large burst of LH that directly triggers ovulation of the dominant follicle is known as the:

1. As the dominant follicle grows, it secretes increasing amounts of estrogen. 2. Very high estrogen eventually switches the pituitary's normal negative feedback to positive feedback. 3. This positive feedback triggers a large burst of LH release. 4. This event the LH surge, and it is what leads to ovulation. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 27 "The Reproductive System", p.1299 §Hormonal Control of the Ovarian Cycle_