the use of a manual syringe suction system , instead of an electric pump , to aspirate follicles , was associated with a significant increase in the proportion of oocytes with fractured zonae pellucidae ( p less than 0.001 ) , a lower normal fertilization rate ( p less than 0.05 ) and a higher proportion of multipronuclear fertilizations ( p less than 0.001 ) .
C0029045
oocytes
C0043519
zonae pellucidae