Serum gonadotrophin and ovarian activity in the pregnant mare.

The research article focuses on the role and changes of gonadotrophic hormones and ovarian activity during early pregnancy in mares. It follows the findings that these hormones, as well as the physical changes in the ovaries, are crucial for the continuation of pregnancy.

Understanding Gonadotrophin and Ovarian Activity

The study takes its basis from previous research performed by experts like Cole and Hart, who pinpointed the presence of a gonadotrophic hormone in mares’ blood in the early stages of pregnancy. Further research also indicated changes observed in the mare’s ovaries throughout gestation. Some of these changes include:

• An unusually active condition of the ovaries between the 40th and 150th day.
• Ovaries are very large and house numerous follicles, as well as a few functional corpora lutea.

The Role of Corpora Lutea

In addition to the mentioned changes, the researchers claimed that the functional corpora lutea serve important purposes during pregnancy:

• They initially supplement the function of the primary corpus luteum, which starts to decline even in the early stages of pregnancy.
• They maintain the endometrial conditions needed for keeping the pregnancy.

Further Discoveries about Gonadotrophin

More findings have come up since these initial observations were made. This includes understanding more about the place of origin of gonadotrophin and other biological discoveries. These pieces of information have been vital in comprehending the role of hormones and ovarian activity changes in mares during the early stages of their pregnancy. This serves as a continuation of expanding knowledge on equine reproduction.