Human Reproduction, Vol. 16, No. 1, 130-137,
January 2001
© 2001 European Society of Human Reproduction and Embryology
Developmental competence of oocytes after ICSI in the rhesus monkey
1 Division of Reproductive Sciences, Oregon Regional Primate Research Center, Beaverton, OR 97006-3348 and Departments of 2 Obstetrics and Gynecology and 3 Physiology and Pharmacology, Oregon Health Sciences University, Portland, OR 97201-3098, USA
Oocyte quantity and quality are critical to assisted reproductive technology (ART), yet few assessments beyond counting metaphase II (MII) oocytes exist. In this study, 30 ± 2 oocytes per cycle were recovered from rhesus monkeys subjected to follicular stimulation with human gonadotrophins, of which 15 ± 1 were MII. Oocyte quality was investigated by monitoring the developmental potential of oocytes subjected to intracytoplasmic sperm injection (ICSI). Despite uniform fertilization rates (71 ± 4%), progression of embryos to blastocysts varied when expressed as a monthly average, from 20 to 85%, with lows from February to April and again in October, which could be attributed to developmental failure of a significant number of oocyte cohorts (14 of 55). Blastocyst rates, after elimination of failed cohorts, were uniform over time (59 ± 4%). Neither culture conditions, the number of follicular stimulations, nor the individual sperm or oocyte donor were associated specifically with developmental failure, suggesting that intrinsic differences between stimulation cycles account for the observed variation in developmental potential. The in-vivo developmental competence of ICSI-produced embryos grown to blastocysts in vitro was also assessed. Two ongoing pregnancies and the birth of a normal female, `Blastulina', represent landmarks in efforts to expand the use of ART in the rhesus monkey.
Key words: blastocyst/embryo transfer/ICSI/monkey/oocyte quality
4 To whom correspondence should be addressed at: Division of Reproductive Sciences, Oregon Regional Primate Research Center, Beaverton, OR 97006-3348. E-mail: wolfd{at}ohsu.edu
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