Progesterone Device Use Improves Ovum Pick-Up Efficiency in Acyclic Donors

Progesterone Device Use Improves Ovum Pick-Up Efficiency in Acyclic Donors

•Follicle numbers in acyclic mares were higher regardless of treatment.•Follicular diameter was smaller for the progesterone-treated (P4) group.•Oocytes recovered during the acyclic phase were higher for P4-treated mares. The aim of this study was to evaluate follicular dynamics and ovum pick-up (OP...

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Bibliographic Details
Published in:Journal of equine veterinary science Vol. 131; p. 104933
Main Authors: Fanhani, Gabriela Genta, Cavalieri, Fábio Luiz Bim, Andreazzi, Márcia Aparecida, da Silva, Caroline Isabela, Andreazzi, Kelly Cristina, Pereira, Letícia da Costa, Emanuelli, Isabele Picada, dos Santos, José Maurício Gonçalves, Moreski, Danieli Aparecida Bobbo, Colombo, Antonio Hugo Bezerra, Morotti, Fábio, Seneda, Marcelo Marcondes
Format: Journal Article
Language:English
Published: United States Elsevier Inc 01-12-2023
Subjects:
Anestrus
Animals
Breeding season
Donor mares
Female
Follicular dynamics
Horses
Oocytes
OPU
Ovarian Follicle - diagnostic imaging
P4 device
Progesterone
P4 device
Breeding season
Donor mares
Follicular dynamics
OPU
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Summary:•Follicle numbers in acyclic mares were higher regardless of treatment.•Follicular diameter was smaller for the progesterone-treated (P4) group.•Oocytes recovered during the acyclic phase were higher for P4-treated mares. The aim of this study was to evaluate follicular dynamics and ovum pick-up (OPU) efficacy in untreated mares or mares treated with an intravaginal progesterone (P4) device during seasonal anestrus (acyclic) and during the breeding season (cyclic). Six mares (mean age = 5 years), were recruited into an ovum pick-up scheme that was performed every 14 days with and without the P4 device, during the acyclic and cyclic phases. Aspirations amounted to seven procedures with or without the P4 device during each phase. Five ultrasound assessments were performed at each interval between the OPUs. Data on follicular number and diameter as well as the numbers of recovered and the percentage of recovered oocytes were also collected. The number of follicles from mares in the acyclic phase was higher (P < .005) regardless of the treatment. However, the follicular diameter was smaller for the P4 group (P < .005) from the 2nd to the 5th evaluation post-OPU procedure. The percentage of oocytes recovered during the acyclic phase was higher for mares treated with the P4 device (P < .005). The P4 device resulted in follicles with smaller diameters and facilitated OPU efficacy.
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ISSN:0737-0806
1542-7412
DOI:10.1016/j.jevs.2023.104933