Timing of ovulation in the fat‐tailed Qezel ewes after synchronization with vaginal devices containing endogenous or exogenous synthetic progestogens during out of the breeding season

Autor: Alireza Hamisi, Mohsen Eslami, Farhad Farrokhi‐Ardabili, Sina Bahmani
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Veterinary Medicine and Science, Vol 9, Iss 6, Pp 2835-2843 (2023)
Druh dokumentu: article
ISSN: 2053-1095
DOI: 10.1002/vms3.1269
Popis: Abstract Background Wide range of ovulation distribution is the main restricting factor in establishing the pregnancy following oestrus synchronization (ES) and fixed time insemination (FTI) in sheep. Objectives Determining the ovulation time (OVT) following ES with two different vaginal devices, its relation to progesterone and conception upon FTI with frozen/thawed semen. Methods Oestrus was synchronized using either controlled internal drug release (CIDR) (ewe, n = 6; ewe lamb, n = 5) or vaginal sponge (ewe, n = 6; ewe lamb, n = 5) insertion for 12 days, plus Equine chorionic gonadotropin (eCG) at devices removal (Day 0). Sizes of the ovarian follicles were measured using transvaginal probe at −12, 0 and 30–33, 53 h and continued every 3–4 h until 75 h after eCG treatment. Serum progesterone amounts were measured at −12, 0, +2 and +11. Laparoscopic FTI was done at 60.5 ± 0.5 h. Results The CIDR‐treated group initiated and completed ovulations earlier compared to sponge‐treated females (median: 64 vs. 71 h; p
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