What is the best treatment for luteal cysts in a cow that is 90 days postpartum?

The administration of PGF2α (prostaglandin F2 alpha) is the most effective treatment for luteal cysts in a cow that is 90 days postpartum. Luteal cysts are characterized by the presence of a corpus luteum that does not regress as it normally should. This condition can lead to disturbances in the estrous cycle, including prolonged anestrus or irregular estrous cycles.

When PGF2α is administered, it causes the regression of the abnormal corpus luteum, promoting the reestablishment of normal ovarian function. It effectively reduces progesterone levels in the cow, allowing for the development of a new follicular wave and the potential for normal estrous cycling to resume.

While estradiol valerate and progesterone can influence reproductive hormone levels, they do not address the underlying issue of the luteal cyst effectively. Estradiol valerate may stimulate ovarian activity but doesn't promote the regression of the luteal cyst. Similarly, progesterone administration does not facilitate the resolution of the cyst itself and could potentially maintain the abnormal condition.

Manual rupture is generally not a recommended approach as it can introduce risk to the cow, including infection or bleeding, and is not as effective in resolving the cyst compared to pharmacological methods