Effect of Timing of Postovulatory Insemination Relative to Human Chorionic Gonadotropin/Buserelin Treatment With 1 Straw of Frozen-Thawed Semen on Mare Fertility |
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| Affiliation: | 1. Faculty of Veterinary Medicine, Department of Equine Sciences, Utrecht University, Utrecht, The Netherlands;2. Department of Production Animal Medicine, Equine Reproduction, Helsinki University, Finland;3. Cantero de Letur S.L., Letur, Spain;1. Department of Animal Science, Federal University of Viçosa, UFV, Viçosa, MG, Brazil;2. Veterinary School, Federal University of Minas Gerais, UFMG, Belo Horizonte, MG, Brazil;3. Sao Paulo State University, Department of Animal Reproduction and Veterinary Radiology, UNESP, Botucatu, SP, Brazil;4. Santo Amaro University, UNISA, SP, Brazil;1. Cátedra de producción Equina, Universidad Nacional de La Rioja, Argentina, Chamical, La Rioja;2. Laboratorio de Producción Equina, Facultad de Agronomía y Veterinaria, Universidad Nacional de Rio Cuarto, Río Cuarto, Córdoba, Argentina;3. Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands;1. Swedish University of Agricultural Sciences, Clinical Sciences, Uppsala, Sweden;2. Al-Nahrain University - High Institute of Infertility Diagnosis and Assisted Reproductive Technologies, Clinical Reproductive Physiology, Baghdad, Iraq;3. Graf Lehndorff Institute for Equine Sciences, Vetmeduni Vienna, Austria, and Neustadt (Dosse), Germany;4. Artificial Insemination and Embryo Transfer, Department for Small Animals and Horses, Vetmeduni Vienna, Vienna, Austria;5. Jesús Usón Minimally Invasive Surgery Centre (CCMIJU), Assisted Reproduction Unit, Cáceres, Spain;1. University of Helsinki, Faculty of Veterinary Medicine, Paroninkuja 20, 04920, Saarentaus, Finland;2. University of Helsinki, Faculty of Veterinary Medicine, PO Box 66, 00014, Helsinki, Finland |
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| Abstract: | The reproductive management of mares for frozen semen artificial insemination (AI) can be costly and labor intensive. Predicting the exact time of ovulation can be challenging even when ovulation-inducing drugs are used. The main objective of this retrospective study was to determine whether there was an effect of interval between examinations to detect ovulation on likelihood of pregnancy and early embryonic loss in mares after postovulatory breeding with a single straw of frozen/thawed semen. The second objective was to determine the efficacy of two different drugs (human chorionic gonadotropin vs. buserelin) for timely induction of ovulation. The length of the interval from penultimate check to ovulation had no significant effect on pregnancy or embryo loss rates (4 hours: 34.1% and 13.3% vs. 8 hours: 26.1% and 0% and 16 hours: 34.5% and 10%, respectively) nor did the ovulation-inducing drug used, number of the cycle, or the stallion. In conclusion, there appears to be no advantage of checking mares for ovulation during the late evening and night hours when using a postovulatory AI protocol and ovulation-inducing drugs. |
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| Keywords: | Stallion frozen semen hCG Mare Artificial insemination Postovulation breeding Timing of insemination |
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