| Early effects of equine FSH (eFSH) treatment on hormonal and reproductive parameters in mares intended to carry their own pregnancy. | |
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MedLine Citation:
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PMID: 19070442 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Superovulatory treatment may potentially increase the embryo recovery rate and the per-cycle pregnancy rate in normal or subfertile mares that are managed properly. However, some studies suggest a possible negative effect of superovulatory treatment on ovarian follicular maturation and embryo viability. Objectives of the present study were to investigate the early effects of eFSH treatment in reproductively normal mares in terms of: folliculogenesis, pregnancy rate, early embryonic development, reproductive tract parameters (tone and edema), and serum estradiol-17beta and progesterone concentrations. Reproductively sound mares (n=26) were evaluated daily by transrectal palpation and ultrasonography. Five days after spontaneous ovulation, mares were randomly assigned to one of two treatment groups. In the eFSH group, mares (n=16 estrous cycles) were administered eFSH twice daily; beginning when a follicle > or =20mm was detected, and continuing until at least one follicle reached a diameter of > or =35 mm. PGF2alpha was administered 2 days following initiation of eFSH therapy, and hCG was administered approximately 36h after cessation of eFSH therapy. In the control group, mares (n=26 estrous cycles) were administered PGF2alpha 7 days after spontaneous ovulation, and hCG when a follicle > or =35 mm was detected. All mares were bred with fresh semen, monitored for ovulation (Day 0), and evaluated for pregnancy on Days 11-16. Serum estradiol-17beta and progesterone concentrations were analyzed using radioimmunoassay on the Day of hCG administration, and Days 8, 11 and 16. Mares treated with eFSH had more follicles > or =30 mm at the time of hCG administration (2.6+/-0.4 compared with 1.1+/-0.1; P<0.01), and more ovulations (2.3+/-0.5 compared with 1.1+/-0.3; P<0.01). However, pregnancy rates were not significantly different between groups (50%; 8/16 compared with 62%; 16/26). Mean overall daily growth rate of embryonic vesicles from Day 11 to 16 was not statistically different between the two groups (3.3+/-0.3 compared with 3.7+/-0.1 mm/day) (P=0.2); however, was more variable (P<0.01) in the eFSH group (95%CI: 2.6-3.8mm/day) than in the control group (95%CI: 3.5-3.9 mm/day). Administration of eFSH modified the reproductive tract variables and serum concentrations of progesterone and estradiol-17beta on the days that oocyte maturation, fertilization, and early embryonic development are expected to occur. These alterations may be related to the greater incidence of non-ovulatory follicles (25% compared with 0%), fewer embryos per ovulation rate (0.3+/-0.1 compared with 0.6+/-0.1), and the lesser than expected pregnancy rates in the eFSH-treated mares. |
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Authors:
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Tal Raz; Allister Gray; Barbara Hunter; Claire Card |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-11-11 |
Journal Detail:
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Title: Animal reproduction science Volume: 115 ISSN: 1873-2232 ISO Abbreviation: Anim. Reprod. Sci. Publication Date: 2009 Oct |
Date Detail:
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Created Date: 2009-08-03 Completed Date: 2009-10-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7807205 Medline TA: Anim Reprod Sci Country: Netherlands |
Other Details:
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Languages: eng Pagination: 76-87 Citation Subset: IM |
Affiliation:
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Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan S7N 5B4, Canada. tal.raz@usask.ca |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Anovulation / veterinary Drug Administration Schedule Estradiol / blood Estrus / physiology Female Follicle Stimulating Hormone / pharmacology*, therapeutic use Horses Infertility, Female / drug therapy, veterinary Insemination, Artificial / veterinary Ovulation Palpation Pregnancy Pregnancy, Animal / drug effects, physiology* Progesterone / blood |
| Chemical | |
Reg. No./Substance:
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50-28-2/Estradiol; 57-83-0/Progesterone; 9002-68-0/Follicle Stimulating Hormone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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