Induction of Early Cyclicity Using Estradiol Cypionate and Sulpiride on Seasonally Anestrous Mares
| dc.contributor.advisor | Pipkin, John | |
| dc.creator | Looman, Jessica M. | |
| dc.creator.orcid | 0000-0002-3939-5498 | |
| dc.date.accessioned | 2021-02-15T21:43:34Z | |
| dc.date.available | 2021-02-15T21:43:34Z | |
| dc.date.created | 2020-12 | |
| dc.date.issued | 2021-02-12 | |
| dc.date.submitted | December 2020 | |
| dc.date.updated | 2021-02-15T21:43:34Z | |
| dc.description.abstract | This study was designed to evaluate strategies to induce early ovulation in anestrous mares. Thirty-two seasonally anovulatory mares were randomly placed into 4 treatment groups based on their reproductive status. Anestrous (n = 11), transitional (n = 8), and progesterone pre-treated (n = 9) groups were treated in January with 50 mg of estradiol cypionate (ECP) followed 24 h later with 3 g of sulpiride. A control group (C, n = 4) was administered the treatment carrier. Ovaries were scanned every 2 to 3 d via transrectal ultrasound for 60 d following treatment. Day of first and second ovulation was recorded. Embryos were transferred to 10 mares after at least 2 estrous cycles. Blood samples were analyzed for luteinizing hormone (LH) and prolactin (PRL). There was an effect of treatment (P < 0.001) on mean number of days to first ovulation. Mean number of days to first ovulation was less (P < 0.001) in all treated groups than C. There was an effect of treatment on the number of mares that achieved first ovulation (P < 0.001) and second ovulation (P = 0.018). Of 28 treated mares, 23 (82.1%) ovulated within 22 d of treatment. Of 23 mares that had a first ovulation, 15 (65.2%) had a second ovulation within 43 d. There was an effect of the treatment-by-day interaction on plasma mean PRL (P < 0.001) and LH (P = 0.021) concentrations. Ten embryos were transferred across the 3 ECP-sulpiride treated groups with 70% of mares having confirmed pregnancy at 60 d. | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | https://hdl.handle.net/11310/393 | |
| dc.language.iso | en_US | |
| dc.subject | anestrus | |
| dc.subject | anovulatory | |
| dc.subject | cyclicity | |
| dc.subject | estradiol cypionate | |
| dc.subject | mares | |
| dc.subject | sulpiride | |
| dc.title | Induction of Early Cyclicity Using Estradiol Cypionate and Sulpiride on Seasonally Anestrous Mares | |
| dc.type | Thesis | |
| dc.type.material | text | |
| thesis.degree.department | Agricultural Sciences | |
| thesis.degree.discipline | Animal Science | |
| thesis.degree.grantor | West Texas A&M University | |
| thesis.degree.level | Masters | |
| thesis.degree.name | M. S. |