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Roser JF, Meyers-Brown G. Enhancing Fertility in Mares: Recombinant Equine Gonadotropins. J Equine Vet Sci 2019; 76:6-13. [DOI: 10.1016/j.jevs.2019.03.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 03/13/2019] [Accepted: 03/13/2019] [Indexed: 11/30/2022]
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Burden CA, McCue PM, Ferris RA. Effect of Cloprostenol Administration on Interval to Subsequent Ovulation and Anovulatory Follicle Formation in Quarter Horse Mares. J Equine Vet Sci 2015. [DOI: 10.1016/j.jevs.2015.02.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Witt M, Bollwein H, Probst J, Baackmann C, Squires E, Sieme H. Doppler sonography of the uterine and ovarian arteries during a superovulatory program in horses. Theriogenology 2012; 77:1406-14. [DOI: 10.1016/j.theriogenology.2011.11.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Revised: 11/05/2011] [Accepted: 11/06/2011] [Indexed: 11/28/2022]
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Meyers-Brown G, Bidstrup L, Famula T, Colgin M, Roser J. Treatment with recombinant equine follicle stimulating hormone (reFSH) followed by recombinant equine luteinizing hormone (reLH) increases embryo recovery in superovulated mares. Anim Reprod Sci 2011; 128:52-9. [DOI: 10.1016/j.anireprosci.2011.09.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2010] [Revised: 08/26/2011] [Accepted: 09/09/2011] [Indexed: 11/25/2022]
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6
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Raz T, Green GM, Carley SD, Card CE. Folliculogenesis, embryo parameters and post-transfer recipient pregnancy rate following equine follicle-stimulating hormone (eFSH) treatment in cycling donor mares. Aust Vet J 2011; 89:138-42. [DOI: 10.1111/j.1751-0813.2011.00691.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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7
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Meyers-Brown G, McCue P, Niswender K, Squires E, DeLuca C, Bidstrup L, Colgin M, Famula T, Roser J. Superovulation in Mares Using Recombinant Equine Follicle Stimulating Hormone: Ovulation Rates, Embryo Retrieval, and Hormone Profiles. J Equine Vet Sci 2010. [DOI: 10.1016/j.jevs.2010.09.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Cullingford EL, Squires EL, McCue PM, Seidel GE. Attempts at Superovulation of Mares With Porcine Follicle Stimulating Hormone and Recombinant Equine Follicle Stimulating Hormone. J Equine Vet Sci 2010. [DOI: 10.1016/j.jevs.2010.04.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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9
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Evaluation of two oestrus synchronization regimens in eFSH-treated donor mares. Vet J 2010; 188:105-9. [PMID: 20392656 DOI: 10.1016/j.tvjl.2010.03.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2009] [Revised: 03/10/2010] [Accepted: 03/13/2010] [Indexed: 11/23/2022]
Abstract
Reliable methods for regulating oestrus and superovulation in equine embryo transfer (ET) programs are desirable. The objective in this study was to compare two oestrus synchronization methods combined with equine follicle-stimulating hormone (eFSH) treatment in an ET program. In the progesterone and estradiol-17β (P&E) group, mares (n=12) were given progesterone and estradiol-17β, daily for 10 days, followed by prostaglandin (PG)F(2α) on the last day. In the PG group, mares (n=12) were given PGF(2α) 5 days post-ovulation. In both groups donor mares were allocated to eFSH therapy, and were subsequently bred. Embryo recovery and transfer were performed routinely. The interval to ovulation (mean ± SEM, range) was not statistically different between donor mares in the P&E group (10.2±0.3, 9-12 days) and donor mares in the PG group (8.7±0.7, 4-12 days). Among donor mares, the synchrony of ovulations was higher following the P&E regimen (P<0.05); however, there was a tendency (P<0.06) for fewer ovulations than in the PG group (1.5±0.3 vs. 2.5±0.4 ovulations, respectively). Embryo recovery (0.9±0.3 vs. 1.4±0.3 embryo/recovery) and recipient pregnancy rate per transferred embryo (4/9, 44% vs. 4/15, 27%) were similar. It was concluded that the P&E regimen was more reliable for synchronization of oestrus in eFSH-treated mares but the fewer ovulations may curtail any advantage of this regimen.
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Raz T, Amorim MD, Stover BC, Card CE. Ovulation, Pregnancy Rate and Early Embryonic Development in Vernal Transitional Mares Treated with Equine- or Porcine-FSH. Reprod Domest Anim 2010; 45:287-94. [DOI: 10.1111/j.1439-0531.2008.01296.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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11
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The efficacy of recombinant equine follicle stimulating hormone (reFSH) to promote follicular growth in mares using a follicular suppression model. Anim Reprod Sci 2009; 116:291-307. [DOI: 10.1016/j.anireprosci.2009.01.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2008] [Revised: 01/16/2009] [Accepted: 01/23/2009] [Indexed: 11/22/2022]
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Raz T, Gray A, Hunter B, Card C. Early effects of equine FSH (eFSH) treatment on hormonal and reproductive parameters in mares intended to carry their own pregnancy. Anim Reprod Sci 2009; 115:76-87. [DOI: 10.1016/j.anireprosci.2008.11.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2008] [Revised: 10/25/2008] [Accepted: 11/04/2008] [Indexed: 11/16/2022]
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Araujo GHM, Rocha Filho AN, Lopes EP, Moya CF, Alvarenga MA. Use of a Low Dose of Equine Purified FSH to Induce Multiple Ovulations in Mares. Reprod Domest Anim 2009; 44:380-3. [DOI: 10.1111/j.1439-0531.2007.01020.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Comparison of the effects of eFSH and deslorelin treatment regimes on ovarian stimulation and embryo production of donor mares in early vernal transition. Theriogenology 2009; 71:1358-66. [DOI: 10.1016/j.theriogenology.2008.09.048] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2008] [Revised: 09/22/2008] [Accepted: 09/28/2008] [Indexed: 11/23/2022]
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Raz T, Card C. Efficiency of superovulation and in vivo embryo production in eFSH-treated donor mares after estrus synchronization with progesterone and estradiol-17beta. Theriogenology 2009; 72:169-78. [PMID: 19344941 DOI: 10.1016/j.theriogenology.2009.02.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2008] [Revised: 01/25/2009] [Accepted: 02/05/2009] [Indexed: 11/29/2022]
Abstract
Reliable methods of regulating estrus and stimulating superovulations in equine embryo transfer programs are desirable. Our objectives were to investigate the efficacy of a progesterone and estradiol-17beta (P&E) estrus synchronization regimen in mares with and without subsequent equine follicle-stimulating hormone (eFSH) treatment and to examine the effects of eFSH on folliculogenesis and embryo production. Cycling mares were treated with P&E daily for 10 d. On the final P&E treatment day, prostaglandin F(2alpha) was administered, and mares were randomly assigned to one of two treatment groups (n=20 mares/group). In both groups, mares were examined daily by transrectal ultrasonography. In the eFSH group, twice-daily eFSH treatments were initiated at follicle diameter 20 to 25 mm and ceased at follicle > or =35 mm; human chorionic gonadotrophin (hCG) was administered after 36 h. In the control group, eFSH treatments were not given, but hCG was administered at follicle > or =35 mm. Mares were inseminated with fresh semen, and embryo recovery attempts were performed 8 d postovulation. Synchrony of ovulations within each group appeared to be similar. Six mares in the eFSH group failed to ovulate. The eFSH treatment resulted in higher (P<0.05) numbers of preovulatory follicles and ovulations; however, embryo recovery rate did not increase (eFSH 1.0+/-0.4 vs. control 0.95+/-0.1 embryos/recovery attempt), and embryo per ovulation rate was significantly lower (36% vs. 73%). The eFSH-treated mares had significantly higher frequency of nonovulatory follicles (28% vs. 0) and higher periovulatory serum concentrations of estradiol-17beta. Based on our findings, combined P&E and eFSH regimens cannot be recommended for cycling donor mares.
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Affiliation(s)
- T Raz
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
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Raz T, Hunter B, Carley S, Card C. Reproductive performance of donor mares subsequent to eFSH treatment in early vernal transition: Comparison between the first, second, and mid-season estrous cycles of the breeding season. Anim Reprod Sci 2008; 116:107-18. [PMID: 19171444 DOI: 10.1016/j.anireprosci.2008.12.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2008] [Revised: 12/11/2008] [Accepted: 12/11/2008] [Indexed: 11/30/2022]
Abstract
The objective was to compare the reproductive performances associated with the first (Cycle-1), second (Cycle-2), and mid-season (MS-Cycle) ovulations of the breeding season in donor mares that were treated with equine-FSH (eFSH) in the early vernal transition. Mares (n=15) kept under ambient light were examined ultrasonographically per-rectum starting January 30. When an ovarian follicle > or =25mm in diameter was detected, twice daily eFSH treatments were initiated. The eFSH treatments ceased when a follicle > or =35mm was detected, and 36h later hCG was administered. Thereafter, mares were artificially inseminated every 48h until ovulation (Day 0). Trans-cervical embryo recovery attempts were performed on Day 8, and subsequently PGF2alpha was administered. Equine FSH was not administered in the subsequent estrous cycles. In Cycle-2 and in the MS-Cycle, hCG was administered when a follicle > or =35mm was detected; breeding, embryo recovery, and PGF2alpha administration, were similar to Cycle-1. Mares had an untreated estrous cycle (no treatment or breeding) between Cycle-2 and the MS-Cycle. All mares developed follicle(s) > or =35mm after 4.9+/-0.6 days of eFSH treatment, and subsequently ovulations occurred; mean (95% CI) interval from treatment initiation to ovulation was 7.9 (6.5-9.3) days. The number of preovulatory follicles (> or =30mm) at the time of hCG administration (Cycle-1: 2.2+/-0.3 compared with Cycle-2: 1.0+/-0 compared with MS-Cycle: 1.1+/-0.1 follicles), and the number of ovulations (2.5+/-0.4 compared with 1.0+/-0 compared with 1.1+/-0.1 ovulations) were greater (p<0.05) in Cycle-1. Nevertheless, mean embryo numbers did not differ among cycles (0.8+/-0.2 compared with 0.5+/-0.1 compared with 0.5+/-0.1 embryo/mare). On average, embryo morphology grade was less (p<0.05) in Cycle-1 as compared to non-eFSH cycles (combined Cycle-2 and MS-Cycle). This impaired embryo quality could be due to a seasonal effect, or negative effect of the eFSH treatment, which was possibly related to alterations in the hormonal environment (estradiol-17beta and progesterone). A prolonged IOI (>21 days) was recorded in 7 of 15 mares following the Cycle-1 ovulation, but not subsequently. In conclusion, eFSH treatment of vernal transitional donor mares stimulated ovulation within only few days of treatment, and the following embryo recovery rate was at least as good as in the subsequent estrous cycles; however, on average, embryos were morphologically impaired. In subsequent estrous cycles in the breeding season, ovulations, embryo recovery rates, and embryo variables did not appear to be negatively affected; however, the first inter-ovulatory interval of the breeding season was prolonged in approximately half of the mares.
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Affiliation(s)
- Tal Raz
- Department of Large Animal Clinical Sciences, University of Saskatchewan, Saskatoon, Canada.
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McCue PM, Patten M, Denniston D, Bruemmer JE, Squires EL. Strategies for Using eFSH for Superovulating Mares. J Equine Vet Sci 2008. [DOI: 10.1016/j.jevs.2008.01.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Logan NL, McCue PM, Alonso MA, Squires EL. Evaluation of three equine FSH superovulation protocols in mares. Anim Reprod Sci 2007; 102:48-55. [PMID: 17188438 DOI: 10.1016/j.anireprosci.2006.09.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2006] [Accepted: 09/29/2006] [Indexed: 10/24/2022]
Abstract
Superovulation could potentially increase embryo recovery for immediate transfer or cryopreservation. The objectives were to evaluate the effect of pretreatment with progesterone and estradiol (P+E) on follicular response to eFSH and compare doses of eFSH and ovulatory agents on follicular development and ovulation in mares. In Experiment 1, 40 mares were assigned to one of four treatment groups. Group 1 consisted of untreated controls. Group 2 mares were administered eFSH without pretreatment with P+E. Group 3 mares were administered P+E for 10 days starting in mid-diestrus followed by eFSH therapy. Group 4 mares were administered P+E for 10 days followed by eFSH therapy. All treated mares were administered 12.5mg eFSH twice daily and prostaglandins were given on the second day of eFSH therapy. Mares were bred with fresh semen the day of hCG administration and with cooled semen the following day. The numbers of preovulatory follicles and ovulations were lower for mares treated with P+E prior to eFSH treatment. Pretreatment with P+E in estrus also resulted in a lower embryo recovery rate per ovulation compared to the other two eFSH treatment groups. In Experiment 2, two doses of eFSH (12.5 and 6.25mg) and two ovulation-inducing agents (hCG and deslorelin) were evaluated. The number of preovulatory follicles was greater for mares given 12.5mg of eFSH compared to mares given 6.25mg. Number of ovulations was greatest for mares given 12.5mg of eFSH twice daily followed by administration of hCG. Embryo recovery per flush was similar among treatment groups, but the percent of embryos per ovulation was higher for mares given the low dose of eFSH. In summary, there was no advantage to giving P+E prior to eFSH treatment. In addition, even though the lower dose of eFSH resulted in fewer ovulations, embryo recovery per flush and embryo recovery per ovulation were similar or better for those given the lower dose of eFSH.
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Affiliation(s)
- N L Logan
- Animal Reproduction and Biotechnology Laboratory, Foothills Campus, Colorado State University, Fort Collins, CO 80523-1683, USA
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Abstract
Equine follicle stimulating hormone (eFSH) has been used to induce follicular development in transitional mares and problem acyclic mares, as well as superovulate cycling mares. The most efficacious protocol is to administer 12.5 mg eFSH, intramuscularly, twice daily beginning 5 to 7 days after ovulation when the diameter of the largest follicle is 20 to 25 mm. Prostaglandins are to be administered on the second day of eFSH therapy. Treatment with eFSH is continued for 3 to 5 days until follicle(s) are >or=35 mm in diameter. The mare is subsequently allowed to 'coast' for 36 h, after which human chorionic gonadotropin is administered to induce ovulation.
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Affiliation(s)
- P M McCue
- Colorado State University, Ft. Collins, CO 80523, and Rood and Riddle Equine Hospital, Lexington, KY 40580, United States.
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Salvetti P, Theau-Clément M, Beckers JF, Hurtaud J, Guérin P, Neto V, Falières J, Joly T. Effect of the luteinizing hormone on embryo production in superovulated rabbit does. Theriogenology 2007; 67:1185-93. [PMID: 17321587 DOI: 10.1016/j.theriogenology.2007.01.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2006] [Revised: 12/19/2006] [Accepted: 01/15/2007] [Indexed: 11/20/2022]
Abstract
For most domestic animals, the responses to superovulation treatments are not controlled as a consequence of the lack of knowledge on exogenous gonadotrophins effects on the ovarian function. The role of luteinizing hormone (LH) on the number and quality of embryos produced was evaluated on rabbit does superovulated with porcine FSH (pFSH). Parameters of embryos recovery, in vitro and in vivo embryo development rates after freezing/thawing were compared. We used three experimental groups: (1) control group without superovulation treatment, (2) "pFSH+pLH" and (3) "pFSH" groups where females were treated with pFSH, respectively, with (20%) or without (0%) porcine LH supplementation. The number of corpora lutea and the number of embryos produced were significantly higher (p<0.001) in superovulated does than in control group (27.1, 26.7 versus 11.9 corpora lutea and 20.3, 21.2 versus 9.6 embryos produced for pFSH+pLH, pFSH and control group, respectively). However, both gonadotrophins administrations (groups 2 and 3) led to defaults of ovulation when compared with untreated does. No significant difference was observed between the number and quality of the embryos produced by does treated with pFSH+pLH or with pFSH alone. Moreover, we observed no significant difference between results of in vivo and in vitro viability assays after thawing. We concluded that pFSH alone seems to be sufficient to stimulate the follicles growth and that exogenous pLH administrated has no effect on the quantity and quality of embryos. Further studies are needed to evaluate the hormonal patterns before and after the gonadotrophins injections in the rabbit species.
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Affiliation(s)
- Pascal Salvetti
- Université de Lyon, ENVL/ISARA Lyon, Unité CRYOBIO, 23 rue Jean Baldassini, 69364 Lyon Cedex 07, France.
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