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Plasma Progesterone Levels of Corpus Luteum during Pregnancy in Microchiropteran Bat Hipposideros Speoris (Schneider)

Author Affiliations

  • 1 Department of Zoology, Bhalerao Science College, Saoner, Dist. Nagpur, Maharashtra, INDIA

Res. J. Recent Sci., Volume 2, Issue (ISC-2012), Pages 7-9, February,2 (2013)


The peripheral plasma progesterone concentrations were measured by radio immunoassay during the complete life span of corpus luteum in the Microchiropteran bat, Hipposideros speoris (Schneider). Soon after the ovulation during mid December all the females in the colony become pregnant irrespective of their age. Hence the corpus luteum formed during estrus period itself forms corpus luteum of pregnancy. Due to sinistral dominance the ovulation was restricted exclusively to the left side of the ovary and consequently the corpus luteum was formed in the same ovary every time and the progesterone concentration found to be 16.8 ng/ml. Two types of corpus luteum intra-ovarian and extrovert have been observed. Some of the specimens collected during December and January showed an intra-ovarian large corpus luteum occupying major part of the ovary whereas in the other it was extrovert appearing as an umbrella during late December and the progesterone valus was elevated to 20.2ng/ml. During early January it reaches its maximum size just prior to implantation of the blastocyst, when it mushrooms out into a nearly spherical ball, with its main bulk projecting out from the ovarian surface and the progesterone level was 28.8ng/ml. It develops maximally by the time the blastocyst reaches the uterus (mid-January) and was nearly as large as rest of the ovary attached to it by small pedicle, the progesterone level was rose and remained high till the regression (30.3 ng/ml). The commencement of regression of the corpus luteum was synchronised with the formation of the early trophoblastic placenta with shrinkage in its size was noticed until it occurred as a small stump projecting from the surface of the ovary at the time when the chorio-vitelline placenta was well established during early and mid-February and a fall in the mean progesterone level was noted (3.1 ng/ml). The progesterone concentration rose steeply (30.1 ng/ml) and reached a plateau till March and April. Soon after the establishment of the chorio-allantoic placenta the corpus luteum became fibrous and was restricted to a corner. It was reabsorbed during mid-pregnancy (late March) and by late gestation (late April) it was completely lost in the stroma.


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