ArticleOpen veterinary journal2025
Seasonal effects on follicular dynamics and hemodynamics, ovarian hormone levels, nitric oxide levels, and lactate dehydrogenase levels in native mares.
Article in Open veterinary journal, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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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: Season (Cold 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.
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