Theriogenology: The effect of ovarian status and follicular diameter on maturational ability of domestic cat oocytes

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  • UCHIKURA Kenzo
    Department of Theriogenology, School of Veterinary Medicine, Faculty of Agriculture, Tottori University
  • NAGANO Masashi
    Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University
  • HISHINUMA Mitsugu
    Department of Theriogenology, School of Veterinary Medicine, Faculty of Agriculture, Tottori University

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  • The Effect of Ovarian Status and Follicular Diameter on Maturational Ability of Domestic Cat Oocytes

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The objective of this study was to clarify the effect of ovarian status and follicular size on morphological normality and maturational ability of cat oocytes. Ovarian status was classified into inactive, follicular, luteal and prepubertal, and follicles were classified into three groups according to their diameter (400-800, 800-1200 and 1200-2000 μm). In each ovarian status, the number of follicles decreased but the percentage of morphologically normal oocytes increased with the growth of follicles (p<0.05). Only a single follicle that was 1200-2000 μm in diameter was observed in two of the five prepubertal cats. In follicles that were 800-1200 μm in diameter, the percentage of normal oocytes and maturation rate were higher in prepubertal cats than in mature cats (p<0.05). Oocyte diameter tended to increase with the growth of follicles. After oocytes were cultured individually in droplets of maturation medium, the oocyte maturation rate increased with the growth of follicles in each ovarian status (p<0.05). In conclusion, oocytes collected from larger follicles possess higher maturational ability in vitro in sexually mature cats. In prepubertal cats, a higher maturation rate can be obtained from oocytes derived from small follicles compared with in mature cats.<br>

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