The Relationship Between Oocyte Morphology and Ovarian Status in Cattle

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  • NAGANO Masashi
    Laboratory of Theriogenology, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University Department of Theriogenology, School of Veterinary Medicine, Faculty of Agriculture, Tottori University
  • HISHINUMA Mitsugu
    Department of Theriogenology, School of Veterinary Medicine, Faculty of Agriculture, Tottori University
  • KATAGIRI Seiji
    Laboratory of Theriogenology, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University
  • TAKAHASHI Yoshiyuki
    Laboratory of Theriogenology, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University

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We investigated the relationships between oocyte morphology, follicular size and follicular waves using bovine ovaries derived from local abattoirs. Ovaries at the recruitment and selection phases contained larger numbers of oocytes with good developmental ability, although ovaries at the recruitment phase contained the largest numbers of follicles compared with ovaries at the selection and dominant phases. Dominant phase ovaries contained a high percentage of oocytes with as good developmental ability as selection phase ovaries; however, they contained the lowest total number of oocytes with good developmental ability. Small follicles under 3.0 mm in diameter contained large numbers of small and degenerating oocytes. In contrast, follicles more than 3.0 mm in diameter contained a higher percentage of oocytes with good developmental ability. <br>

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