Which hormone inhibits FSH production to prevent oestrus and ovulation?

The hormone that inhibits FSH (follicle-stimulating hormone) production to prevent oestrus and ovulation is progesterone. During the reproductive cycle, after ovulation occurs, the corpus luteum forms and secretes progesterone. This hormone has multiple roles, one of which is to maintain the uterine lining for potential implantation of an embryo.

Progesterone specifically exerts a negative feedback effect on the pituitary gland, reducing the secretion of FSH. By inhibiting FSH levels, progesterone helps to prevent the development of additional follicles in the ovaries, thus blocking further oestrus cycles and ovulation during its dominant phase. This mechanism is critical for ensuring that the body does not prepare for another reproductive cycle while a potential pregnancy is being supported.

In contrast, the other hormones listed do not have a direct role in inhibiting FSH production in the same way as progesterone does. Thyroid hormones and growth hormone play important roles in metabolism and growth but do not primarily affect reproductive hormone regulation like progesterone does. Oestrogen, while involved in the reproductive cycle, generally works to stimulate FSH (during the follicular phase) rather than inhibit it in the presence of high levels. This distinction underscores the importance