The corpora lutea
start to form once ovulation occurs; when the embryos are in stage 2, the follicular sac appears flaccid and has a cavity in the center left by the recently ovulated oocyte.
Reactivation of regressing corpora lutea
by estradiol in the pregnant rat: dependence on placental lactogen.
In New Hampshire, age, antler spread, antler beam diameter (ABD), number of points, corpora lutea
(CL) count, and field-dressed body weight of hunter-harvested moose have been measured since 1988.
It is interesting to note that both the number of implantation sites and corpora lutea
decreased in the alkaloid-treated animals when the process of implantation ought to have been completed (implantation takes place normally within 5-6 days post-coitus in rats) before the exposure of the animals to the alkaloid mixture (treatment commenced from day 10 of pregnancy).
Levels of messenger ribonucleic acid encoding cholesterol side-chain cleavage cytochrome P-450, 17 alpha-hydroxylase cytochrome P-450, adrenodoxin, and low density lipoprotein receptor in bovine follicles and corpora lutea
throughout the ovarian cycle.
copeii female from March with corpora lutea
from a previous clutch (SDSNH 26753), two other females from March with enlarged follicles (> 5 mm), and one female from June with oviductal eggs and concomitant yolk deposition for a subsequent egg clutch (MVZ 37260).
Reproductive characteristics of females were assessed by examining ovaries and uterine horns for presence and number of corpora lutea
, blastocysts, and embryos using methods described by Hamilton & Eadie (1964) and Gilbert (1987).
Treatment of dams during the preimplantation period showed no signs of toxicity, and no alteration in the corpora lutea
, implantations and embryo in terms of development numbers.
The deposits are so extensive that the corpora lutea
appear as circumscribed amyloid tumors (fig.
In June-July, oviposition occurred, and females collected in July showed only previtellogenic and atretic follicles, whereas corpora lutea
had been reabsorbed (Fig.
For microscopic examination, sections were selected using a nonrandom 10% sampling method and ovarian follicles and corpora lutea
were counted in every 10th section of the ovary (25), in a fashion that each counted section was separated by a distance of approximately 50-60 [micro]m from the next 10th section.
Sections cut from paraffin-embedded ovaries were stained with hematoxylin and cosin to count preovulatory follicles, corpora lutea
, antral follicles, and atretic follicles using a light microscope as described by Parborell et al.
Microvascularization and angiogenic activity of equine corpora lutea
throughout the estrous cycle.
(CL) exhibit extremely rapid growth, differentiation and regression during each estrous cycle.
The number and the mean value of corpora lutea
per female decreased from 25.