Characterization of the ovarian preantral follicle populations and its correlation with age and nutritional status in Brazilian Northeastern donkeys (Equus assinus)

Lopes, K. R. F.; Lima, Gabriela Liberalino; Bezerra, Luana Grasiele Pereira; Barrêto-Júnior, Raimundo Alves; Oliveira, Moacir Franco de; Silva, Alexandre Rodrigues

doi:10.1016/j.anireprosci.2017.11.007

Cited by 6 publications

(3 citation statements)

References 41 publications

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“…2020 , Benammar et al 2021 ). Studies assessing preantral follicle population have been conducted in jennies ( Lopes et al 2017 ), ewes ( Amorim et al 2000 ), does ( Lucci et al 1999 ), cows ( Lucci et al 2002 , Silva-Santos et al . 2011 ), gilts ( Alves et al 2012 ), and women ( Gougeon & Chainy 1987 ).…”

Section: Introductionmentioning

confidence: 99%

Preantral follicle population and distribution in the horse ovary

Hyde

Aguiar

Alves

et al. 2022

Reproduction and Fertility

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Characterization of the ovarian preantral follicle population is a necessary step to improve understanding of folliculogenesis and ovarian physiology. Therefore, in the present study, the preantral follicle population in the equine ovary in young and old mares was investigated according to follicular morphology, follicular class, distance from the geometric center using ovarian maps, and follicular density within ovarian portions (lateral vs. intermediary) and regions (dorsal vs. ventral). Ovaries were collected from an abattoir and histologically processed for evaluation, and the follicle population was calculated. Overall, in the current detailed study, a higher preantral follicle population per mare ovary (mean, 82,206 ± 50,022; range, 1,477 to 773,091) than originally reported was identified. Additionally, a mare age effect was observed on the follicle population (young: 152,664 vs. old: 11,750) and the spatial distribution of morphologically normal and abnormal follicles and the density and population of follicular classes. These results demonstrate that, in addition to the preantral follicle population in the mare ovary being comparable to that of other species, the location and spatial distribution of these follicles is dynamic and varies depending on mare age and follicle status (i.e., morphology and developmental stage). The characterization of the distribution and population of preantral follicles in the mare ovary provided by this study can potentially aid in improving reproductive studies and assisted reproductive techniques and may expand the understanding of mechanisms involving ovarian plasticity and follicular migration.

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Section: Introductionmentioning

confidence: 99%

Preantral follicle population and distribution in the horse ovary

Hyde

Aguiar

Alves

et al. 2022

Reproduction and Fertility

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“…For these animals, weight can be considered the main factor interfering with follicular development and the interval between reproductive seasons, as BSC is associated with an increase in reproductive activity (Nagy et al, 2000;Lopes et al, 2017), as recorded for the animals from this work. Rainfall influenced the ovarian activity since most ovulation occurred during the rainy season, when pasture growth was exuberant, which promoted forage intake resulting in higher weight gain and BSC levels.…”

Section: Discussionmentioning

confidence: 74%

The ovarian and uterine responses of Baixadeiro mares to prostaglandin synchronization during the dry and rainy seasons

et al. 2022

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This study aimed to evaluate the effect of synchronization with prostaglandin F2α in Baixadeiro mares during the rainy and dry seasons. Fourteen mares were synchronized by administering two doses of 1 mL prostaglandin PGF 2α and monitored by rectal palpation and ultrasound for the assessment of follicular development and uterine echotexture. Of this total, nine mares allowed the collection of blood, in which the blood was collected by venipuncture of the jugular vein to determine progesterone (P4) by ELISA. Mares showed no differences (P > 0.05) in weight, body score condition (BSC), tone, uterine edema, frequency of ovulation, synchronization interval, estrus, and the total number of follicles between periods. However, there was a difference in large increased follicle diameter (P < 0.05) during the dry season. The average concentrations of P4 in mares differed (P < 0.05) between the pre-and post-ovulatory phases for both seasons and after ovulation, with higher concentrations in the rainy season. Furthermore, statistical differences in daily light (P < 0.05) were observed between the dry and rainy periods. Thus, we conclude that mares from the genetic grouping Baixadeiro showed no reproductive seasonality, though there was a difference in luminosity between the rainy and dry seasons. The treatment with two doses of PGF 2α was effective in synchronizing the mares, promoting the return of estrus in the dry and rainy periods. The mares remaining cyclically active throughout the year provided there were appropriate forage availability and quality levels to allow for normal values of body weight and condition.

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“…In six-banded armadillos ( Table 2 ), it was observed that the follicular population is significantly influenced by infection by Mycobacterium leprae , since the species is a natural reservoir for this microorganism that transmits leprosy ( Brasil et al, 2021 ). In Northeastern donkeys ( Table 2 ), it was observed that the follicular population is influenced by both age and body condition of the females ( Lopes et al, 2017 ). Thus, these studies show that there are some particularities regarding the population and follicular category between species.…”

Section: Preservation and Use Of Ovarian Tissuesmentioning

confidence: 99%