Studies on the ovary of the Japanese deer, Cervus nippon in the Nara Park - Postnatal development and seasonal changes.
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Ovaries of ten neonatal doe fawns (2 to 40 days old), five yearling does (6 to 20 months old) and twenty-four adult does (2 to 20 years old) were used to investigate the postnatal development and seasonal and ageing changes. <BR>1. Ovaries of neonatal doe fawns were filled predominantly with primordial and primary follicles and the largest follicle found in this group was about 0.5mm in diameter. Exceptionally large fol-licles exceeding 1mm were found in two doe fawns. <BR>2. In ovaries of yearling does, particularly those obtained in a rutting season, more or less deve-loped follicles were noted. As no corpus luteum was found in a yearling doe group, it may be as-sumed that the follicle, though it attains 3 to 4mm in size, will not be ovulated. Various kinds of atretic bodies were commonly noted in neonatal and yearling doe groups. <BR>3. The ovary weight of adult does showed a variation relating to the ovarian structure and the disappearance of the vesicular follicle was characteristic in aged does (more than 15 years old). Pri-mordial and primary follicles were also decreased in number in aged does. Therefore, the effective reproductive life span of the Japanese deer seems to be around 14 years. <BR>4. Several large follicles attaining 4 to 5mm in size were noted in ovaries of adult does irrespec-tive of the season. A follicle which attained more than 5mm in size seems to be ovulated twice or three times during a rutting season (from October to December). In most ovaries of adult does, various kinds of atretic follicles were noted throughout the year.
- 日本繁殖生物学会の論文
日本繁殖生物学会 | 論文
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