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a Oregon Regional Primate Research Center,
b Department of Obstetrics and Gynecology, and Cell and Developmental Biology, Oregon Health Sciences University, Beaverton, Oregon 97006
Artificial insemination (AI) and the cryopreservation of sperm with full reproductive capabilities are vital in the armamentarium of infertility clinics and reproductive laboratories. Notwithstanding the fantastic successes with AI and sperm cryopreservation in numerous species, including humans and cattle, these assisted reproductive technologies are less well developed in other species of importance for biomedical research, such as genetically modified mice and nonhuman primates. To that end, AI at high efficiency in the rhesus macaque (Macaca mullata) and the successful cryopreservation of rhesus sperm is presented here, as are the complexities of this primate model due to differences in reproductive tract anatomy and gamete physiology. Cryopreservation had no effect on the ability of sperm to fertilize oocytes in vitro or in vivo. Post-thaw progressive motility was not affected by cryopreservation; however, acrosome integrity was lower for cryopreserved (74.1%) than for fresh sperm (92.7%). Fertilization rates did not differ when fresh (58.1%; n = 32/55) or cryopreserved sperm (63.8%; n = 23/36) were used for in vitro fertilization. Similarly, pregnancy rates did not differ significantly after AI with fresh (57.1%; n = 8/14) or cryopreserved sperm (62.5%; n = 5/8). Seven live rhesus macaques were born following AI with fresh sperm, and three live offspring and two ongoing pregnancies were obtained when cryopreserved sperm were used. Cryopreservation of rhesus sperm as presented here would allow for the cost-effective storage of lineages of nonhuman primates with known genotypes. These results suggest that either national or international centers could be established as repositories to fill the global needs of sperm for nonhuman primate research and to provide the experimental foundation on which to explore and perfect the preservation of sperm from endangered nonhuman primates.
1 Supported by research grants from the NIH (NICHD, NCRR) to G.S. The ORPRC infrastructure is sponsored as an NCRR Regional Primate Research Center.
2 Correspondence: Gerald Schatten, Oregon Regional Primate Research Center, 505 N.W. 185th Ave., Beaverton, OR 97006. FAX: 503 614 3725; schatten{at}ohsu.edu
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