Fig. 3.

Fertilization rate of in vitro matured sheep oocytes The black line shows a curve of fertilization rate of normal IVM oocytes;The red line shows presumably an ideal curve of fertilization of IVM oocytes with extended fertile span treated by an inhibitor. The fertilization rate (%) is defined with the number of cleaved oocytes/the number of cultured oocytes ×100%. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)