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

作者：Uchikura Kenzo; Nagano Masashi; Hishinuma Mitsugu^*

来源：Journal of Veterinary Medical Science, 2011, 73(5): 561-566.

DOI：10.1292/jvms.10-0381

• feline
• follicle
• oocyte maturation
• ovary
• prepuberty

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 mu m). 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 mu m in diameter was observed in two of the five prepubertal cats. In follicles that were 800-1200 mu m 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.

• 出版日期2011-5