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Use of Oocyte Transfer in a Commercial Breeding Program to Obtain Pregnancies from Mares with Reproductive Pathologies
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1. Introduction
Oocyte transfer involves collection of an oocyte from the follicle of a donor, and transfer of the oocyte into a recipient’s oviduct. The recipient is inseminated, and fertilization and embryo development occurs within the recipient’s reproductive tract. Oocyte transfer resulted in pregnancies in research mares.1,2 However, embryo development rates were significantly reduced when oocytes from old mares (> 20 years) vs. young mares ( < 10 years) were transferred.1 Although the transfer of oocytes has been indicated for certain reproductive pathologies (i.e., severe endometritis or pyometra, cervical lesions, oviductal occlusion, ovulation failure),3 this procedure had not been attempted in a group of clinically subfertile mares. During the 1998 breeding season, the viability of oocyte transfer as a method to obtain pregnancies from mares with long histories of infertility and various reproductive pathologies was studied.
2. Materials and Methods
Mares (n = 18) were presented to Colorado State University (CSU) for various periods of time during the 1998 breeding season (May through September). The mares represented seven breeds and were between 16 and 30 years of age. All mares had long histories of reproductive failure in breeding and embryo transfer programs. One or more of the following pathologies were diagnosed per mare: persistent endometritis or pyometra (n = 6), intermittent or repeated ovulatory failure (luteinized or hemorrhagic follicles, n = 7), nonfunctional cervix (n = 3), and ovarian pathology (n 5 1). In five mares > 20 years of age, no definitive cause for reduced fertility was determined, however, previous repeated embryo transfer attempts were unsuccessful. […]
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Affiliation of the authors at the time of publication
Colorado State University, Animal Reproduction and Biotechnology Laboratory, Fort Collins, CO, USA.
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