ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2013, Vol. 44 ›› Issue (8): 1317-1322.doi: 10.11843/j.issn.0366-6964.2013.08.021

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Ultrastructure Observation on Mink Preantral Follicle Oocytes during Dioestrus

CUI Kai, LIANG Yu-ying, MA Ze-fang*   

  1. (College of Animal Science and Technology, Qingdao Agricultural University,Qingdao 266109, China)
  • Received:2013-02-23 Online:2013-08-23 Published:2013-08-23

Abstract:

In order to study the developmental regularity of mink oocytes during dioestrus in November and to evaluate the in vitro maturing possibility of them, ultrastructure of ovaries preantral follicles of American short-hair black minks during dioestrus were observed by transmission electron microscope. Results showed that there were a less number of cristae at the primordial follicle stage. Golgi apparatus were visible. The size of lipid droplets was different, and cortical granules dispersed around the nucleus. At the primary follicular stage, the number of mitochondrion was increasing. Golgi apparatus tended to be typical. Lipid droplets distributed evenly. Cortical granules monolayer dispersed near the plasma membrane. At secondary follicle stage, the number of cristae was increasing. Flocks of Golgi apparatus distributed under the plasma membrane. The diameter of lipid droplets was increasing and the color of those was shallower. The results suggest that the distribution of cortical granules and Golgi apparatus in mink oocytes during dioestrus in November was different from that during estrus; while the developmental trend of mitochondria, endoplasmic reticulum, lipid droplets and other organelles during these two periods was the same. Therefore it is possible that mink oocytes obtained in November develop to mature in vitro.

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