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Infrequent structures in cattle oocytes

R J Assey1, P Hyttel, J F Roche

  • 1Department of Anatomy and Physiology, Royal Veterinary and Agricultural University, Frederiksberg, Denmark.

Anatomy and Embryology
|September 1, 1994
PubMed
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This study observed rare cattle oocyte structures, including novel vesicles potentially for cortical granule synthesis. Differences were noted between Bos taurus and zebu cattle oocytes and under different stimulation conditions.

Area of Science:

  • Reproductive Biology
  • Oocyte Development
  • Veterinary Science

Background:

  • Cattle oocyte structures are not fully understood, especially uncommon and controversial ones.
  • Follicular dominance and hormonal stimulation (FSH, cloprostenol) influence oocyte maturation.
  • Variations exist between cattle breeds like Bos taurus and zebu (Bos indicus).

Purpose of the Study:

  • To investigate uncommon and controversial structures in cattle oocytes.
  • To compare oocyte structures in dominant and subordinate follicles of unstimulated and stimulated cattle.
  • To examine the effect of cloprostenol and FSH stimulation on oocyte ultrastructure.

Main Methods:

  • Oocytes were collected from unstimulated and FSH-stimulated Bos taurus and zebu cattle.

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  • Oocytes were also collected before and after cloprostenol administration.
  • Oocyte ultrastructure was examined using microscopy.

    • Main Results:

    • Special vesicles, potentially involved in cortical granule synthesis, were observed for the first time.
    • Classical rough endoplasmic reticulum was rare in unstimulated oocytes but present after superovulation.
    • Nucleolar vacuolation was common in dominant oocytes post-cloprostenol, except in superovulated cattle.
    • Annulate lamellae were less frequent in Bos taurus oocytes compared to zebu oocytes.

    Conclusions:

    • Hormonal stimulation and follicular status significantly impact cattle oocyte ultrastructure.
    • Novel vesicles suggest a previously undescribed mechanism for cortical granule synthesis.
    • Breed differences (Bos taurus vs. zebu) in oocyte structures like annulate lamellae warrant further investigation.