Figure 1.

Allethrin exposure exerted toxic effects on ovarian function. Photomicrographs of ovarian sections from the control group (A) showed normal ovarian structures containing normal growing follicles (large arrows), whereas photomicrographs of allethrin-treated ovaries (B) showed altered structures in most of the growing follicles (arrows), as revealed by oocyte vacuolization and degradation, and this finding was obtained with both doses. Although few normal follicles were observed (large arrows), cystic dilation of follicles with decreased numbers of sparse granulosa cells was also observed with both exposure doses (B,C). Some of the ovaries from the higher dosage treated groups were reduced in size and contained cysts and degenerating follicles (C).