Histomorphic changes in the ovary during the estrous cycle of a wild rat, Bandicota bengalensis

1984 ◽  
Vol 62 (6) ◽  
pp. 1052-1058 ◽  
Author(s):  
Abhiram Sahu
Keyword(s):  
Estrous Cycle ◽  
Frequency Distribution ◽  
Ovarian Follicles ◽  
Corpora Lutea ◽  
Bandicota Bengalensis ◽  
Preovulatory Follicles ◽  
Wild Rat ◽  
Size Groups

Histomorphic changes in the ovary of Bandicota bengalensis were studied during various stages of the estrous cycle. The ovarian follicles were classified into nine size groups and their frequency distribution was determined for the different phases. In all the ovaries 70% of the follicles were nonantral and below 201 μm in diameter. During proestrus and estrus the ovary possessed the highest number of nonatretic follicles. The follicles ranging above 600 μm were absent at metestrus and diestrus. Preovulatory follicles (>700 μm) were present only during estrus, indicating ovulation during the night of the day of estrus. Excepting the 30- to 50-μm follicles, all other follicles were susceptible to atresia in the cycling rats. Maximum atresia was noticed in the 201- to 500-μm follicles. The number of atretic follicles was highest at diestrus and lowest at estrus. In the continuous diestrous rats, about 50% of the atretic follicles were in the range of 30–100 μm. Three recognizable types of corpora lutea were found in the ovary. The volume of the first and second type corpora lutea was highest at proestrus and estrus, respectively. Mean number of first and second type corpora lutea was 3.87 and 4.56, respectively, and thus about four ova ovulated per ovary during each estrous cycle in this wild rat.

scholarly journals Ovarian Follicular Dynamics during the Estrous Cycle in Jennies in Upper Egypt

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
R. I. Derar ◽  
H. A. Hussein
Keyword(s):  
Growth Rate ◽  
Estrous Cycle ◽  
Slow Rate ◽  
Ovarian Follicles ◽  
Maximum Diameter ◽  
Dominant Follicle ◽  
Upper Egypt ◽  
Follicular Wave ◽  
Preovulatory Follicles ◽  
Follicular Dynamics

The objective of the current study was to describe follicular dynamics in Egyptian Jennies throughout the estrous cycle. In this experiment, 8 estrus cycles in 8 cyclic Jennies were studied from February to June using ultrasonography. The result revealed that one follicular wave per cycle was recorded throughout the studied period. Dominant follicle (DF) was firstly detected at day in Jennies. The growth rate of DF was  mm/day. Left ovulations were nonsignificantly () more than right ovulations (55.6% versus 44.6%). The CL was firstly detected at D , developed in a rate of  mm/day, reached a maximum diameter of  mm at D , and started to regress on D with a mean regression rate of  mm d-1. Results of the present study indicated that Jennies had one follicular wave per cycle. The Day of the cycle has a significant effect on the number of different classes of the ovarian follicles, but not large ones. Ultrasonographic characteristics of the preovulatory follicles could be useful to predict ovulation. CL developed and regressed in a slow rate.

scholarly journals Luteinization of porcine preovulatory follicles leads to systematic changes in follicular gene expression

Reproduction ◽  
2006 ◽  
Vol 132 (1) ◽  
pp. 133-145 ◽  
Author(s):  
Cansu Agca ◽  
James E Ries ◽  
Sarah J Kolath ◽  
Jae-Hwan Kim ◽  
Lawrence J Forrester ◽  
...  
Keyword(s):  
Gene Expression ◽  
Gene Expression Profile ◽  
Expression Profile ◽  
Structural Changes ◽  
Ovarian Follicles ◽  
Cdna Libraries ◽  
Corpora Lutea ◽  
Examine Gene Expression ◽  
Preovulatory Follicles ◽  
Migratory Cells

The LH surge initiates the luteinization of preovulatory follicles and causes hormonal and structural changes that ultimately lead to ovulation and the formation of corpora lutea. The objective of the study was to examine gene expression in ovarian follicles (n= 11) collected from pigs (Sus scrofa domestica) approaching estrus (estrogenic preovulatory follicle;n= 6 follicles from two sows) and in ovarian follicles collected from pigs on the second day of estrus (preovulatory follicles that were luteinized but had not ovulated;n= 5 follicles from two sows). The follicular status within each follicle was confirmed by follicular fluid analyses of estradiol and progesterone ratios. Microarrays were made from expressed sequence tags that were isolated from cDNA libraries of porcine ovary. Gene expression was measured by hybridization of fluorescently labeled cDNA (preovulatory estrogenic or -luteinized) to the microarray. Microarray analyses detected 107 and 43 genes whose expression was decreased or increased (respectively) during the transition from preovulatory estrogenic to -luteinized (P<0.01). Cells within preovulatory estrogenic follicles had a gene-expression profile of proliferative and metabolically active cells that were responding to oxidative stress. Cells within preovulatory luteinized follicles had a gene-expression profile of nonproliferative and migratory cells with angiogenic properties. Approximately, 40% of the discovered genes had unknown function.

scholarly journals SERUM LH IN EWES FOLLOWING SEQUENTIAL REMOVAL OF OVARIAN FOLLICLES, CORPORA LUTEA AND STROMA

Reproduction ◽  
1974 ◽  
Vol 40 (1) ◽  
pp. 215-218 ◽  
Author(s):  
J. F. ROCHE ◽  
F. J. KARSCH ◽  
D. L. FOSTER ◽  
P. J. DZIUK
Keyword(s):  
Ovarian Follicles ◽  
Corpora Lutea ◽  
Serum Lh

scholarly journals Stage-specific uptake of apolipoprotein-B in ovarian follicles and corpora lutea of the menstrual cycle and early pregnancy

1998 ◽  
Vol 13 (4) ◽  
pp. 944-952 ◽  
Author(s):  
S. Yamada ◽  
H. Fujiwara ◽  
N. Kataoka ◽  
T. Honda ◽  
T. Nakayama ◽  
...  
Keyword(s):  
Menstrual Cycle ◽  
Early Pregnancy ◽  
Apolipoprotein B ◽  
Ovarian Follicles ◽  
Corpora Lutea ◽  
Specific Uptake
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