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- Title
Estrus and ovulation synchronization in mares for timed artificial insemination using fresh or frozen semen followed by timed-embryo transfer.
- Authors
Simioni Felicio, Liédge Camila; Barcellos Felicio, Gabriel; Ernandes Kozicki, Luiz; Scheffer Pereira, João Filipe; Scheffer Pereira da Silva, Maria Theresa; Romualdo Weiss, Romildo; Bergstein-Galan, Tácia Gomes; Talini, Rafaela
- Abstract
Two protocols were evaluated for prostaglandin F2α-based ovulation induction during timed artificial insemination (TAI) and timed embryo transfer in mares: (1) deslorelin acetate (DESL), and (2) DESL and human chorionic gonadotrophin (DESL+hCG). Donor embryo recovery rate (ERR), recipient pregnancy rate (PR), and ovulation time (OT) were assessed in donors and recipients, allocated into 2 groups: DESL (n=79) and DESL+hCG (n=89). The DESL group was treated according: day zero (D0) ultrasonography examination (US)+PGF2α; D7/D8 US+DESL; D9/D10 US+TAI using frozen semen or TAI on D7/D8 with fresh semen; embryo recovery and embryo transfer were performed on D19 and in D23 the pregnancy diagnosis. The DESL+hCG group (n=89) was treated according to the same protocol, except that on D7, DESL+hCG (IV) were administered. A difference (P<0.0001) was observed in the time of ovulation after induction with DESL or DESL+hCG groups. The ERR of donors was 71.42% (DESL) and 64.28% (DESL+hCG) in mares inseminated with fresh semen, and 66.66% (DESL) and 73.68% (DESL+hCG) inseminated with frozen semen. The PR in mares that received embryos from fresh semen was 70% (DESL) and 55.55% (DESL+hCG) and that received embryos from frozen semen was 59.09% (DESL) and 60.71% (DESL+hCG) (P>0.05). In conclusion, no difference in the ERR in the donor mares, or PR in the recipients was observed between the administered protocols. Compared to the DESL-only protocol, the combined DES+hCG protocol showed significant reduction in time between the administration of inductors and ovulation. No difference was observed in the ERR and PR with respect to use of fresh or frozen semen.
- Subjects
FROZEN semen; ARTIFICIAL insemination; ESTRUS synchronization; INDUCED ovulation; MARES; OVULATION; ESTRUS
- Publication
Pferdeheilkunde, 2021, Vol 37, Issue 4, p417
- ISSN
0177-7726
- Publication type
Academic Journal
- DOI
10.21836/PEM20210408