title: Attempt at intracytoplasmic sperm injection of in vitro matured oocytes in common minke whales (Balaenoptera acutorostrata) captured during the Kushiro Coast Survey.
abstract: The present study was conducted during the Kushiro Coast Survey in an attempt to produce common minke whale embryos. In Experiment 1, we attempted to determine the appropriate culture duration (30 or 40 h) for in vitro maturation (IVM) of immature oocytes using the Well of the Well method. In Experiment 2, and intracytoplasmic sperm injection (ICSI) was applied to matured oocytes from prepubertal and adult common minke whales after IVM culture (40 or 48 h), and then their embryonic development was assessed. In Experiment 1, the maturation rate of oocytes cultured for 40 h (30.4%) was significantly higher than that of oocytes cultured for 30 h (6.8%; P<0.01). In Experiment 2, a total of 35 and 46 immature oocytes derived from adult (n=2) and prepubertal (n=6) minke whales, respectively, were cultured for 40 or 48 h. The maturation rate in the oocytes from the adult whales (34.2%) tended to be higher than that of the oocytes from the prepubertal whales (19.6%), but there was no significant difference. Following ICSI, 3 out of the 10 inseminated and cultured oocytes from the adult whales cleaved (2-, 8-, and 16-cell stages); all of these oocytes had been matured for 40 in culture. However, these oocytes did not develop to further stages. Only one of the 6 oocytes derived from the prepubertal whales, IVM cultured for 40 h and inseminated, developed to the 4-cell stage. The present results indicate that a 40 h IVM culture produces significantly higher rates of in vitro maturation than a 30 h IVM culture for common minke whale oocytes. Following ICSI, some oocytes cleaved to the 16-cell stage, but no further development was observed.
authors.affiliation: Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan. fukui@obihiro.ac.jp
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Fukui
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Iwayama
authors.forename: Taiki
authors.initials: T
authors.lastname: Matsuoka
authors.forename: Hiroki
authors.initials: H
authors.lastname: Nagai
authors.forename: Noriko
authors.initials: N
authors.lastname: Koma
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Mogoe
authors.forename: Hajime
authors.initials: H
authors.lastname: Ishikawa
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Fujise
authors.forename: Masumi
authors.initials: M
authors.lastname: Hirabayashi
authors.forename: Shinichi
authors.initials: S
authors.lastname: Hochi
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Kato
authors.forename: Seiji
authors.initials: S
authors.lastname: Ohsumi
mesh_terms: D000367:Age Factors; D000818:Animals; D005260:Female; D005307:Fertilization in Vitro / Q000662:veterinary*; D066298:In Vitro Techniques; D050636:Minke Whale / Q000502:physiology*; D009865:Oocytes / Q000166:cytology*; D020554:Sperm Injections, Intracytoplasmic / Q000662:veterinary*