Ovarian follicular populations in pony and saddle-type mares.
Abstract: Five pony and 5 saddle-type mares were used to compare total ovarian follicular populations between breeds. The animals were hemi-ovariectomized at the preovulatory stage during the breeding season and the ovary bearing the large preovulatory follicle was studied using histological techniques. Pony and saddle-type mares did not differ as to mean number of primordial follicles, mean number of growing follicles, the variability of these numbers and follicular distribution into various size classes. No difference was detected either in the initiation processes of follicular growth, oocyte growth, granulosa cell multiplication and follicular atresia. However, significant differences were found in the pattern of antral formation (P less than 0.01). The present data suggest that pony mares are a valuable tool for the study of follicular populations in equines. The main features of the equine ovary are the small number of follicles (35 950 primordial and 100 growing follicles) and the high individual variability of this number (5 600 to 75 000 primordial and 20 to 300 growing follicles).
Publication Date: 1982-01-01 PubMed ID: 7163613DOI: 10.1051/rnd:19820714Google Scholar: Lookup
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- Comparative Study
- Journal Article
Summary
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The research focuses on comparing the total ovarian follicular populations between pony mares and saddle-type mares to determine any significant differences, primarily in characteristics such as the mean number of primordial and growing follicles, their distribution across different sizes, and patterns of antral formation.
Methodology
- In this study, five ponies and five saddle-type mares were chosen for comparative analysis.
- The chosen animals were hemi-ovariectomized at the preovulatory stage during their breeding season. This process involved the removal of one ovary from each participant.
- The ovary bearing the large preovulatory follicle was particularly studied using histological techniques. Histological techniques involve the microscopic study of the anatomy of the cells and tissues.
Findings
- No differences were found between the two horse types in the mean number of primordial follicles, which are the undeveloped egg cells stored in the ovarian tissue, or in the mean number of growing follicles.
- Similarly, the variability of these numbers and the distribution of follicles into various sizes were found to be similar in both pony mares and saddle-type mares.
- The initiation processes of follicular growth, oocyte growth (that is, the growth and development of female reproductive cells or eggs), granulosa cell multiplication (cells that surround the oocyte and help it mature), and follicular atresia (the natural process of follicular death) were also found to be consistent across breed types.
- However, a significant difference was observed in the pattern of antral formation. Antrum is a cavity within the growing follicle that normally fills with fluid. The study does not specify how the patterns differ.
Implications
- Based on the data collected from this research, it is inferred that pony mares could be used effectively for studying follicular populations in equines. Primarily, this is due to the lack of significant variance in most aspects of their ovarian follicular populations compared to saddle-type mares.
- It is also highlighted that the key features of the equine ovary include a small number of follicles – around 35,950 primordial and around 100 growing follicles. However, there’s high individual variability in these numbers, ranging from 5,600 to 75,000 primordial follicles and 20 to 300 growing follicles.
Cite This Article
APA
Driancourt MA, Paris A, Roux C, Mariana JC, Palmer E.
(1982).
Ovarian follicular populations in pony and saddle-type mares.
Reprod Nutr Dev (1980), 22(6), 1035-1047.
https://doi.org/10.1051/rnd:19820714 Publication
Researcher Affiliations
MeSH Terms
- Animals
- Cell Count
- Cell Differentiation
- Cell Nucleus / ultrastructure
- Female
- Granulosa Cells / cytology
- Horses / physiology
- Mitosis
- Oocytes / ultrastructure
- Ovarian Follicle / anatomy & histology
- Ovarian Follicle / growth & development
- Ovary / physiology
- Theca Cells / cytology
Citations
This article has been cited 4 times.- Hyde KA, Aguiar FLN, Alves BG, Alves KA, Gastal GDA, Gastal MO, Gastal EL. Preantral follicle population and distribution in the horse ovary. Reprod Fertil 2022 Apr 1;3(2):90-102.
- Benammar A, Derisoud E, Vialard F, Palmer E, Ayoubi JM, Poulain M, Chavatte-Palmer P. The Mare: A Pertinent Model for Human Assisted Reproductive Technologies?. Animals (Basel) 2021 Aug 4;11(8).
- Max MC, Bizarro-Silva C, Búfalo I, González SM, Lindquist AG, Gomes RG, Barreiros TRR, Lisboa LA, Morotti F, Seneda MM. In vitro culture supplementation of EGF for improving the survival of equine preantral follicles. In Vitro Cell Dev Biol Anim 2018 Dec;54(10):687-691.
- Derar RI, Hussein HA. Ovarian Follicular Dynamics during the Estrous Cycle in Jennies in Upper Egypt. Vet Med Int 2011;2011:860518.
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