Echotextural changes in the follicular wall during follicle deviation in mares.
Abstract: The echotextural changes occurring in the follicular wall in association with deviation in diameters were studied in 8 pony mares. Echotextural changes could be useful as a reference point for future studies of the follicle-selection phenomenon. Follicles were examined daily by transrectal ultrasound from 3 d before to 3 d after the beginning of deviation (Day 0). The following echotextural end points were recorded based on a scoring or percentage system: 1) thickness of granulosa, 2) echogenicity of granulosa, 3) prominence of an anechoic layer located beneath the granulosa, and 4) extent of involvement of the circumference of the follicle by the anechoic layer. Significant main effects indicated increasing values over Days -3 to 3 and a higher mean value for the dominant-follicle status for each end point. The interaction approached significance for thickness of granulosa and was significant for each of the other 3 end points. The interaction seemed due primarily to lower values in the subordinate follicle on Days 2 and 3. The first day of an overall echotextural difference between the 2 largest follicles (15.9 +/- 0.5 d after ovulation) or between days within the largest follicle (16.1 +/- 0.5 d) was about 1 d earlier (P < 0.05) than the beginning of diameter deviation (17.4 +/- 0.8). The effects of follicle diameter versus future follicle status were compared for Days -3 to 0 by grouping follicles for each status into 2 diameter categories (16.0 to 18.9 mm and 19.0 to 22.5 mm). Increasing echotextural values for the granulosa (thickness and echogenicity) were more attributable to follicle growth, whereas the increasing values for the anechoic layer were more attributable to status as a future dominant follicle. Results indicated that development of an anechoic layer beneath the granulosa distinguished the future dominant follicle from the largest future subordinate follicle before the beginning of diameter deviation.
Publication Date: 2000-03-29 PubMed ID: 10735121DOI: 10.1016/S0093-691X(99)00173-9Google Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
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The article presents a study on the texture changes (echotexture) in the follicular wall in pony mares, during a process called follicle deviation. The findings illustrate that these changes can potentially identify the dominant follicle before the beginning of diameter deviation.
Study Overview
- The study analyzed the echotextural changes in the follicular wall of 8 pony mares during follicle deviation using transrectal ultrasound.
- The research aimed to provide potential reference points for further studies on follicle selection using echotextural end-points.
- The echotextural end-points noted in this study included thickness of granulosa, echogenicity of granulosa, prominence of anechoic layer beneath the granulosa, and extent of follicle involvement by the anechoic layer.
Key Findings
- A significant main effect revealed increasing values of all the end-points over Days -3 to 3, as well as a higher average value for the dominant-follicle aspect.
- There was a noteworthy interaction between thickness of granulosa and the other three end-points, primarily due to the decrease in subordinate follicle values on Days 2 and 3.
- Echotextural differences were observed between the two largest follicles about a day before the beginning of diameter deviation.
- Increasing echotextural values for granulosa (thickness and echogenicity) were associated with follicle growth, whereas the increasing values for the anechoic layer were connected to status as a future dominant follicle.
- The results suggested that the development of an anechoic layer beneath the granulosa differentiated the future dominant follicle from the largest future subordinate follicle before the start of diameter deviation.
Significance and Implications
- This study helps in understanding the selection process of dominant and subordinate follicles by studying the changes in their echotextural properties.
- The findings could be instrumental in future research on the topic and pave the way for more comprehensive studies.
Cite This Article
APA
Gastal EL, Donadeu FX, Gastal MO, Ginther OJ.
(2000).
Echotextural changes in the follicular wall during follicle deviation in mares.
Theriogenology, 52(5), 803-814.
https://doi.org/10.1016/S0093-691X(99)00173-9 Publication
Researcher Affiliations
- Department of Animal Health and Biomedical Sciences, University of Wisconsin, Madison 53706, USA.
MeSH Terms
- Animals
- Dinoprost / pharmacology
- Estrus / drug effects
- Estrus / physiology
- Female
- Granulosa Cells / cytology
- Granulosa Cells / diagnostic imaging
- Granulosa Cells / physiology
- Horses
- Ovarian Follicle / anatomy & histology
- Ovarian Follicle / diagnostic imaging
- Ovarian Follicle / physiology
- Ovulation
- Ultrasonography
Citations
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