Seasonal effects on follicular dynamics and hemodynamics, ovarian hormone levels, nitric oxide levels, and lactate dehydrogenase levels in native mares.
Year: 2025
Type: article
Abstract: Background: Summer heat stress affects the regularity of the estrous cycle in different animal species. Aim: This study aimed to investigate seasonal effects on follicular dynamics, hemodynamics, and associated biomarkers across the estrous cycle in native mares. Methods: Doppler ultrasound examinations and blood samples were collected along three sequential estrous cycles during the cold (November to March) and the hot months of the year (May to August). The diameter, antrum diameter, and color area of the dominant follicle (DF) were determined. The diameters, uterine horns, and corpus luteum (CL) diameters, areas, and color areas were estimated. In blood samples, estradiol (E2), progesterone (P4), cholesterol, lactate dehydrogenase (LDH), and nitric oxide (NO) concentrations were determined. Results: < 0.001) influenced the DF antrum diameter/cm and uterine horn color area/pixel. Estrous days of the hot months increased the area, the antrum area, the circumference of the DFs, the area of the uterine horns, total cholesterol, NO, and LDH. Conclusion: In mares, the season of the year did not disturb the ovarian macro-environmental dynamics, DF growth, and recruitment but disrupted blood flow mediators, enzymes, and biochemicals that may associate disturbances in the intrafollicular mediators and influence the oocyte quality. It is recommended that mares be breeded under suitable environmental conditions during the cold months when good quality green food is available.
Source: PubMed
Institutions: National Research Centre, Cairo University
Language: English
Subfield: Agronomy and Crop Science
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W7128312145
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