Comparative histomorphological study of endometrium in mares

Herrera, M; Herrera, Juan M.; Cantatore, S.; Aguilar, José Javier; Felipe, Antônio; Fumuso, E.

doi:10.1111/ahe.12335

Cited by 13 publications

(9 citation statements)

References 25 publications

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“…The body condition score of mares at foaling and balanced nutritional support provided by permanent grazing warrants adequate nutritional reserve to support lactation, resumption of ovarian cyclicity, and fertile postpartum ovulation while lactating the foals [ 54 , 55 , 56 ]. Finally, differences in peripartum follicular dynamics between PM and NPM groups could be due to individual variations, as if the NPM group were more susceptible than the NP group to postpartum uterine inflammation as reported for cycling mares [ 57 ].…”

Section: Discussionmentioning

confidence: 99%

Follicular Dynamics and Pregnancy Rates during Foal Heat in Colombian Paso Fino Mares Bred under Permanent Grazing

Cardona-García,

Jiménez-Escobar,

Ferrer

et al. 2024

Animals

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No studies have evaluated the peripartum follicular dynamics resulting in foal heat under tropical environments. We aimed to assess retrospectively the peripartum follicular dynamics in Colombian Paso Fino mares that were inseminated at the foal heat, becoming pregnant or not. Records including follicular dynamics of pregnant mares prepartum and from foaling until foal heat ovulation were assessed in Colombian Paso Fino mares (CPF, n = 24) bred under permanent grazing in a tropical herd in Colombia. The number of ovarian follicles >10 mm before foaling and the largest follicle (F1) growth rate (mm/day) from foaling until the F1 reached the largest diameter (pre-ovulatory size) at the foal heat were assessed. Mares were inseminated at foal heat with 20 mL of semen (at least 500 million live spermatozoa) with >75% motility and 80% viability from a stallion of proven fertility. Ovulation was confirmed the day after follicles had reached the largest diameter. Quantitative data from follicular growth, the day at ovulation, from mares that became pregnant (PM) or not (NPM) at 16 days post-insemination were compared by one-way ANOVA, repeated measures ANOVA (follicle growth rate data) or Chi-square test (edema and cytology scores data). Epidemiological data, gestation length, and the number of follicles on third prepartum days did not significantly differ between PM and NPM (p > 0.05). Seventy-one percent of mares (17/24) got pregnant. Ovulatory follicles grew faster in the NPM group (n = 7), which ovulated between the seventh and ninth postpartum days, compared to PM (n = 17), which ovulated between the 11th and 13th postpartum days. Pre-ovulatory follicle diameter in PM (48.57 ± 0.8 mm) was significantly larger than in NPM (42.99 ± 1.0 mm) (p < 0.05). In addition, the PM edema score (2.93 ± 0.32 mm) on ovulation day was significantly lower (p < 0.05) than NPM (4.47 ± 0.05 mm). First postpartum ovulation occurred at 12.6 ± 0.3 and 8.5 ± 0.4 days (p < 0.05) in PM and NPM, respectively. Colombian Paso Fino mares bred under permanent grazing under tropical rainforest conditions with no foaling or postpartum complications showed a 71% gestation rate when inseminated at foal heat when ovulation occurs between the second and third postpartum week.

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Section: Discussionmentioning

confidence: 99%

Follicular Dynamics and Pregnancy Rates during Foal Heat in Colombian Paso Fino Mares Bred under Permanent Grazing

Cardona-García,

Jiménez-Escobar,

Ferrer

et al. 2024

Animals

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“…Although several studies have been carried out on END there is no complete understanding of the etiopathogenesis of this disease (England et al 2021). A study reported that epithelial heigh, glandular diameter, and density were greater in susceptible mares than in resistant to persistent post-breeding END during estrus (Herrera et al 2018). In contrast, in the current study, ET, GC height, and glandular density did not change between NE and END.…”

Section: Discussionmentioning

confidence: 99%

The importance of the diestrus stages (early, middle, late) to the diagnosis of the endometrial disease in the bitch

et al. 2023

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The endometrium is the uterine layer wherein embryo implantation and development take place.Complete knowledge of the endometrium's normal histology is critical for advancing the diagnosis of subclinical endometrial diseases. Several researchers studied subclinical endometritis (END) in different species but the cause/s remain unknown. Furthermore, simple and reliable diagnostic tools are still necessary to diagnose subclinical END. In the bitch, diestrus has been selected as the stage of the reproductive cycle to perform the diagnosis of END. This work aimed to perform morphometric and cytological studies in bitches with normal endometrium (NE) and END in diestrus' stages. Forty-ve mixed-breed clinically healthy bitches, in diestrus, were used in this study. Biopsies and cytology were obtained from uterine horns, processed, and examined using a microscope. Samples from NE and END were selected, images acquired, and software for image analysis was used to measure the endometrial thickness (ET), external glandular diameter (EGD), internal glandular diameter (IGD), glandular density, and glandular cell height (CG). Signi cant differences were observed in GC height, EGD, IGD, and serum P 4 concentrations along diestrus. In END, both EGD and IGD were smaller than NE. The current study showed histomorphometric characteristics that appear to be in uenced by P 4 concentrations. In our opinion, it is relevant to consider how far the bitch had progressed into diestrus at the moment of the diagnosis of endometrial disease. Data recorded in the present study could be helpful to clarify cases of bitches with unexplained infertility or subfertility.

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“…1B-1D). A study reported that epithelial heigh, glandular diameter, and density were greater in susceptible mares than in resistant to persistent post-breeding END during estrus (Herrera et al 2018). In contrast, ET, GC height, and glandular density did not change between NE and END in this study.…”

Section: Discussionmentioning

confidence: 99%

Morphometric changes on the endometrium during diestrus stages in bitches with and without histological endometritis

Praderio

Rearte

Mitacek

et al. 2022

Preprint

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The endometrium is a uterine layer essential for achieving optimal embryo implantation and development. Complete knowledge of the endometrium's normal histology is critical for advancing the diagnosis of subclinical endometrial diseases. Several researchers studied subclinical endometritis (END) in different species; however, the cause is unknown, and simple and reliable diagnostic tools are still necessary. In the bitch, diestrus has been selected as the stage of the reproductive cycle to perform diagnostic. This work aimed to perform morphometric and cytological studies in bitches with normal endometrium (NE) and END in the diestrus' different stages. Forty-five mixed-breed bitches, clinically healthy in diestrus, were used in this study. Biopsies and cytology were obtained from uterine horns, processed, and examined using a microscope. Samples from NE and END were selected, photographs were taken, and software for image analysis was used to measure the endometrial thickness (ET), external glandular diameter (EGD), and internal glandular diameter (IGD), glandular density, and glandular cells (GC) height. Significant differences were observed in GC height, EGD, IGD, and serum P4 concentrations along diestrus. In END, EGD and IGD were smaller than NE. The current study showed histomorphometric characteristics that appear to be influenced by P4 concentrations. In our opinion, it is relevant to consider the diestrus stage at the moment of the diagnosis of endometrial disease. Data recorded in the present study could be helpful to bitches with unexplained infertility or subfertility.

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Comparative histomorphological study of endometrium in mares

Cited by 13 publications

References 25 publications

Follicular Dynamics and Pregnancy Rates during Foal Heat in Colombian Paso Fino Mares Bred under Permanent Grazing

Follicular Dynamics and Pregnancy Rates during Foal Heat in Colombian Paso Fino Mares Bred under Permanent Grazing

The importance of the diestrus stages (early, middle, late) to the diagnosis of the endometrial disease in the bitch

Morphometric changes on the endometrium during diestrus stages in bitches with and without histological endometritis

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