describe the sequence of hormones beginning with those affected by increasing day length that: Bring a mare into estrous and then to ovulation. The Role of Light Progression in the Hormonal Sequence of the Mare’s Estrous Cycle

The Role of Light Progression in the Hormonal Sequence of the Mare’s Estrous Cycle
The hormone sequence of the mare’s estrous cycle is driven by the progression of increasing day length. The mare’s hormones are affected as the days get longer. This eventually brings her to estrous, and then to ovulation. In the mare’s estrous cycle, the initial hormones affected by increasing day length are the hypothalamic hormones, GnRH and kisspeptin. GnRH (a hormone secreted by the hypothalamus) stimulates the release of LH and FSH by pituitary. (Munoz Cueto, 2020). Kisspeptin is another hypothalamic hormonal hormone that acts in hypothalamus to increase GnRH (Zhao and al., 2017). This hormone cascade leads to a surge in LH, which is the primary hormone responsible for the mare’s receptiveness to breeding. The LH surge triggers the mare’s estrous cycle and leads to the ovulatory follicle becoming the dominant follicle in the ovary (Robinson et al., 2016). As the LH surge continues, the dominant follicle produces increasing amounts of progesterone, which is essential for the mare’s receptiveness to breeding. Cont….
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