What substances are used to induce lysis of a corpus luteum in a sow at 30-48 days?

The correct choice identifies the use of prostaglandins and corticosteroids to induce lysis of a corpus luteum in a sow during the specified time frame of 30-48 days of gestation. Prostaglandins, particularly Prostaglandin F2α (PGF2α), are well known for their role in luteolysis, which is the breakdown of the corpus luteum. This process is crucial in swine reproduction as it leads to the cessation of progesterone production, allowing the sow to return to estrus if not pregnant.

Corticosteroids can also influence this process, enhancing the lytic effects of prostaglandins, although their primary role is more associated with physiological stress responses rather than direct luteolysis. Together, these substances effectively signal the ovary to break down the corpus luteum, effectively managing reproductive cycles in sows.

The other substances do not play prominent roles in inducing luteolysis in swine during this stage of gestation. Estrogens and progesterones are involved in the maintenance of pregnancy rather than its termination. GnRH and LH are more closely linked to stimulating ovulation and the initiation of the estrous cycle, making them less relevant in this context. Oxytocin