Biology of Reproduction, Vol 36, 376-383, Copyright © 1987 by Society for the Study of Reproduction

ARTICLES

Development potential of bovine oocytes matured in vitro or in vivo

ML Leibfried-Rutledge, ES Critser, WH Eyestone, DL Northey and NL First

Bovine oocytes matured in vivo or in vitro were evaluated after sperm- oocyte incubation for frequency of sperm penetration, frequency of male pronuclei formation, and embryonic development. The frequency of sperm penetration was not different for in vitro matured oocytes (216/295, 73%) vs. in vivo matured oocytes (119/176, 70%). However, formation of male pronuclei was reduced (p less than 0.05) for oocytes matured in vitro (149/216, 69%) vs. in vivo (104/119, 88%). Early embryonic development was evaluated 48 h after the onset of sperm-egg incubations. In vitro matured and fertilized oocytes failed to develop to the 2-cell stage (3/88, 3%), whereas oocytes matured in vivo showed normal development (23/56, 40%) to the 2- and 4-cell stage. Development to the blastocyst stage was evaluated after 5 days in ovine oviducts (in vivo). Morulae and blastocysts were obtained only after in vitro fertilization from oocytes that were in vivo-matured (recovered from oviduct, 14/56, 25%; recovered from follicle, 36/80, 45%). Oocytes that were matured in vitro and fertilized in vitro failed to develop to morulae (0/33) in vivo.

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