File:Canine oocyte to blastocyst.jpg

Canine Oocyte to Blastocyst

Canine oocytes and embryos observed under light microscopy at different stages after ovulation. Maturation stages were determined by confocal microscopy.

A Canine oocytes, Metaphase II, 82h (3.5 days) post-ovulation. The oocytes have lost their mucified mass, but are still surrounded by the corana radiata.

B Two-cell canine embryos collected 137h (5.7 days) after ovulation.

C Four-cell and eight-cell canine embryos, 153h (6.4 days) after ovulation.

D Eight-cell canine embryos collected 174h (7.2 days) after ovulation still have a few granulosa cells around their zona pellucida.

E Morula stage canine embryos collected 254h (10.6 days) after ovulation.

F Early blastocyst stage canine embryos, collected 265h (11 days) after ovulation.

Image Source: Image contributed by Dr Karine Reynaud, Department of Life Sciences and Health and UMR Developmental and Reproduction Biology ENVA, UMR 1198 Biologie du De ́veloppement et Reproduction, 7 Avenue du Ge ́ne ́ral De Gaulle, 94700 Maisons-Alfort, France. CINRA, UMR 1198 Biologie du De ́veloppement et Reproduction, F-78350 Jouy en Josas, France. Who kindly provided these images of the developing dog. Images are for educational purposes only and cannot be reproduced electronically or in writing without permission.