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Reproductive Technology |
Division of Reproductive Sciences3
Division of Animal Resources,4 Oregon National Primate Research Center, Beaverton, Oregon 97006
Departments of Obstetrics/Gynecology and Physiology and Pharmacology,5 Oregon Health and Science University, Portland, Oregon 97201
New England Clinic of Reproductive Medicine, Inc.,6, Reading, Massachusetts 01867
The assisted reproductive technologies (ARTs) as tailored to the production of rhesus monkeys at the Oregon National Primate Research Center (ONPRC) are described. Efficient fertilization of mature oocytes recovered by aspiration from females subjected to follicular stimulation was achieved with fresh or frozen sperm by intracytoplasmic sperm injection (ICSI). Embryo development to the early cleavage stage occurred at high frequency. Cryopreserved embryos showed high postthaw survival and were also transferred in efforts to establish pregnancies. Three methods of transfer were evaluated, two involving embryo placement into the oviduct, laparoscopy and minilaparotomy, and a nonsurgical, transcervical approach that resulted in uterine deposition. Early cleaving embryos (Days 1–4) were transferred into the oviducts of synchronized recipients with optimal results and pregnancy rates of up to 36%. Pregnancy rates were similar when two fresh or frozen embryos were transferred (28– 30%), although more than two embryos had to be thawed to compensate for embryo loss during freeze-thawing. Normal gestational lengths, birth weights, and growth curves were seen with ART-produced infants compared with infants produced by natural mating in the timed mated breeding (TMB) colony at the ONPRC. In 72 singleton pregnancies established following the transfer of ART-produced embryos, the live-birth rate, at 87.5%, was statistically identical to that for the TMB colony. Further development of the ARTs should result in increasing use of these techniques to augment conventional approaches to propagating monkeys, especially those of defined genotypes.
2 Correspondence: Don P. Wolf, Oregon National Primate Research Center, 505 N.W. 185th Ave., Beaverton, OR 97006. FAX: 503 533 2494; wolfd{at}ohsu.edu
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