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report7, #4 - that the secondary CL does not ovulate but...

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Theresa Gorecki ANS069 2-26-08 Question #4 Although it is known that approximately 80% of mares develop a secondary or accessory Corpus Luteum, it is not known why this is 100%, nor is it known what advantages are held with this additional component. It is known that this secondary corpus luteum is formed as a result of endometrial cups, which, along with the secondary corpus luteum, is exclusive to horses in the livestock breeds. The Endometrial cups produce ECG, or Equine Corrionic Genatition, which acts as a combination of FSH and LH to reduce atresia and increase selection. It is also known that, like a primary CL, the secondary CL is composed of luteal cells which produce progesterone. It is believed
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Unformatted text preview: that the secondary CL does not ovulate, but rather is there during early gestation for an extra boost of progesterone. It would be a good implication that, since the CL’s main responsibility during pregnancy is to produce progesterone to maintain an environment that is conducive to embryonic growth, this secondary CL helps to further avoid contractions of the myometrium, nurture the embrio, and keep the uterus a tranquil place for the growing embryo. It would be rational to believe that there is limited research on this topic because of the use of the equine species in our lives....
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