Correlations of corpus luteum blood flow with fertility and progesterone in embryo recipient mares

• Published in: Tropical animal health and production Vol. 53; no. 2; p. 280
• Main Authors: Sales, Felipe Augusto Boudoux Martins, Azevedo, Marlon Vasconcelos, Souza, Natalia Matos, Ferreira-Silva, José Carlos, Chaves, Maiana Silva, Junior, Valdir Riberio, Rocha, Jorge Motta, dos Santos Filho, José Pompeu, Freitas, Vicente José de Figueirêdo, Oliveira, Marcos Antonio Lemos
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.06.2021; Springer Nature B.V
• Subjects: Artificial insemination; Biomedical and Life Sciences; Blood flow; Corpus luteum; Doppler effect; Embryo transfer; Embryos; Endometrium; Fertility; Life Sciences; Ovulation; Perfusion; Pregnancy; Progesterone; Regular Articles; Ultrasound; Vascularization; Veterinary Medicine/Veterinary Science; Zoology; Doppler ultrasonography; Ovary; Reproduction; Progesterone; Vascularization
• ISSN: 0049-4747; 1573-7438
• DOI: 10.1007/s11250-021-02583-9

The aim of this study was to evaluate the correlation between the corpus luteum vascularization with the concentration of progesterone and the fertility of embryo recipient mares. Mangalarga Marchador mares ( n = 33) were distributed into groups according to the days (D) after ovulation, as follows: D3 ( n = 8), D4 ( n = 8), D5 ( n = 9), and D6 ( n = 8). The evaluations of the corpus luteum, endometrium, and blood collection to quantify the progesterone concentration were carried out on D3, D4, D5, and D6. Among the parameters evaluated, only progesterone concentration on D6 differed from the other groups ( P <0.05). A positive correlation ( P <0.05) between the diameter and the area of the corpus luteum, and the objective and subjective methods of the corpus luteum vascular perfusion, was identified. Likewise, a positive correlation ( P <0.05) was observed between the objective and subjective methods of the vascular perfusion in the corpus luteum and the progesterone concentration. The pregnancy rate obtained in this study (54.54%) was not affected ( P > 0.05) by the day of embryo transfer, whose percentages were 37.50% (3/8) on D3, 50% (4/8) on D4, 66.70% (6/9) on D5, and 62.50% (5/8) on D6. It was estimated that with each increase on the day of embryo transfer, the pregnancy rate increases. The results allow to conclude that the corpus luteum vascularization in mares, evaluated by Doppler ultrasound, correlates with progesterone concentration and the embryo transfer day.