Corpus Luteum Vascularization and Progesterone Production in Autumn and Winter Cycles of the Mare: Relationship Between Ultrasonographic Characteristics of Corpora Lutea and Plasma Progesterone Concentration in the Last Cycles Before Anestrus |
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| Affiliation: | 1. Dipartimento di Scienze Veterinarie, Università di Pisa, Pisa, Italy;2. INRA, CNRS, Université de Tours, Haras Nationaux, UMR 6175, Physiologie de la Reproduction et des Comportements, Nouzilly, France;1. Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX;2. Department of Animal Science, College of Agriculture and Environmental Sciences, University of California-Davis, Davis, CA;1. Departamento de Medicina y Cirugía Animal, Facultad de Veterinaria, Universidad CEU Cardenal Herrera, Valencia, Spain;2. Producción Equina, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, Argentina;3. Ansager Dyrehospital, Ansager, Denmark;4. Warren House Farm, Equine Fertility Clinic, Brownhills, West Midlands, UK;1. Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra 50, 40064, Ozzano dell’Emilia, Bologna, Italy;2. Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Via Belmeloro 8, 40126, Bologna, Italy;3. Health Science and Technologies Interdepartmental Center for Industrial Research (HST-ICIR), University of Bologna, Via Tolara di Sopra 50, 40064, Ozzano dell’Emilia, Bologna, Italy;1. Department of Physics, Politecnico di Milano. Piazza Leonardo da Vinci 32, 20133 Milano, Italy;2. DPG, Università di Padova. Via Venezia 8, 35131 Padova, Italy |
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| Abstract: | In 20 estrus cycles of 15 mares, Color Doppler ultrasound of corpora lutea and plasma progesterone concentration (P4) was analyzed on days 6, 10, 14, 16, and 18 after ovulation. Progesterone concentration was positively correlated with corpora lutea cross-sectional area (CSA), vascularized area (VA), and index of vascularization (IV = VA/CSA) (P < .0001). Cross-sectional area, VA, and IV in corpora lutea of mares with P4 < 1 ng/mL were significantly lower than in corpora lutea of mares with P4 > 1 ng/mL. Mares with CSA < 3,473 pixels, VA < 25.5 pixels, and IV < 7.6% were prone to express P4 < 1 ng/mL 25.4, 7.9, and 7.6 times more than mares with higher values, respectively. Corpus luteums analyzed parameters differed significantly between last cycles (LCs) of the breeding season and previous cycles until day 14 after ovulation (P < .05). No significant differences were found in P4 between LCs and previous ones. |
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| Keywords: | Mare Corpus luteum Color Doppler ultrasound Progesterone Fall transition |
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