Factors Affecting Recipients' Pregnancy,Pregnancy Loss,and Foaling Rates in a Commercial Equine Embryo Transfer Program |
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| Institution: | 1. Dipartimento di Scienze Veterinarie, Università degli Studi di Pisa, Pisa, Italy;2. Private practitioner, Pisa, Italy;1. Laboratory of Reproductive Technologies, Avantea, Cremona, Italy;2. Department of Veterinary Medical Sciences, University of Bologna, Italy;3. Fondazione Avantea, Cremona, Italy;1. Univ Estadual Paulista (UNESP), Department of Animal Reproduction and Veterinary Radiology, SP18618-970, Brazil;2. Univ Estadual Paulista (UNESP), Department of Veterinary Clinics, SP18618-970, Brazil;3. School of Animal Sciences, Louisiana State University, Baton Rouge 70803-4210, USA;4. School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803, USA;1. PS Pferdehaltung, Neustadt-Glewe, Germany;2. Clinic for Horses—Unit for Reproductive Medicine, University of Veterinary Medicine Hannover, Hannover, Germany;3. Clinic for Animal Reproduction Medicine, Vetsuisse Faculty, University of Zürich, Switzerland;4. Swiss Institute of Equine Medicine, Agroscope and University of Berne, Avenches, Switzerland |
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| Abstract: | During 11 breeding seasons, 351 7- to 10-day-old horse embryos were nonsurgically transferred into recipients that ovulated between 3 and 10 days earlier. Pregnancy rates at 14 and 40 days and foaling rates were 77.8% (273/351), 69.2% (243/351), and 64.4% (226/351), respectively. Pregnancy loss between 14 and 40 days was 11% and between 40 days and delivery was 7%. The transfer of quality grade 3 to 4 embryos resulted in a significantly lower pregnancy rate at 14 days compared with the transfer of grade 1 to 2 embryos (46.2% vs. 79%; P < .05). Eight-day-old embryos resulted in significantly lower pregnancy losses than day 9 or 10 embryos, as occurred for embryos between 400 and 1200 μm compared with embryos <400 μm. Embryos recovered from mares >20 years resulted in a significantly higher pregnancy loss rate than those recovered from younger mares. The same happened for embryos coming from mares affected by reproductive pathologies compared with healthy mares performing sport activity. None of the evaluated parameters influenced recipients' foaling rate significantly. |
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| Keywords: | Embryo transfer Pregnancy rate Foaling rate Recipient selection |
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