PMID: 1863321Jan 1, 1991

Follicle and oocyte growth in early postnatal calves: cytochemical, autoradiographical and electron microscopical studies

Reproduction, Nutrition, Development
A J MhawiJ Motlík


The initiation of oocyte and follicle growth was studied in 1- and 3-d-old calf ovaries using cytochemical, autoradiographical and electron microscopical approaches. Attention was only paid to unilaminar ovarian follicles that were classified into 3 categories: unilaminar flattened (UF), unilaminar flatto-cuboidal (UFC) and unilaminar cuboidal (UC) ovarian follicles when the oocyte was surrounded by 1 layer of flattened, a mixture of flattened and cuboidal and entirely cuboidal follicle cells, respectively. Our findings suggested that oocytes within each of these follicle categories were in different developmental stages. Furthermore, electron microscopic observations revealed that early after birth, oocyte nuclei characteristic of diplotene configuration (aggregation of the nuclear chromatin into moderately electron-dense small patches and fibrillo-granular texture of the nucleolus) were encountered in 41% of the UF follicles. The rest of the UF as well as all of the UFC and UC follicles were found to contain dictyate oocytes in which the chromatin was highly decondensed and the nucleolus differentiated into fibrillar, fibrillo-granular and granular components. The present results also indicated that the complete transition of...Continue Reading


Sep 16, 2000·Molecular and Cellular Endocrinology·H M Picton, R G Gosden
Apr 20, 2011·The Journal of Reproduction and Development·Rong-Mei BaoTakashi Miyano
Jun 24, 2010·Theriogenology·Rong-Mei BaoTakashi Miyano
May 11, 2005·The Journal of Reproduction and Development·Takashi Miyano
Jan 21, 2020·Reproductive Medicine and Biology·Md Hasanur Alam, Takashi Miyano
Dec 29, 2010·Veterinary Medicine International·E R AndradeRicardo Toniolli

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