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Carbofuran, a systemic N-methyl carbamate pesticide was orally administered with the doses of 0.4, 0.7, 1 and 1.3 mg/kg body weight/day to normal virgin female Swiss albino mice for 30 days. The vaginal smear and body weight of mice were recorded daily and mice were sacrificed on the 31st day. Estrous cycle was effected by showing a significant decrease in the number of estrous cycle and the duration of each phases of estrous cycle with concomitant significant increase in the diestrus phase in 1 and 1.3 mg/kg/d carbofuran treatment when compared with that of control mice. There was a significant decrease in the number of healthy follicles and a significant increase in the number of atretic follicles in 1 and 1.3 mg/kg/d treated groups when compared with the control. The histologic observations of the ovary revealed the presence of less number of healthy follicles and more number of atretic follicles in high dose of carbofuran treated mice. There was a dose dependent decrease in the body weight. The ovary weight was also decreased significantly in 1.3 mg/kg/d carbofuran treatment. There were no significant change in the weight of the organs such as uterus, kidney, adrenal, liver, spleen, thymus and thyroid. These observed effects of carbofuran on the estrous cycle and follicles may be due to a direct effect on the ovary or the hypothalamo-hypophysial ovarian axis causing hormonal imbalance.

Reproductive Toxicity of Carbofuran to the Female Mice: Effects on Estrous Cycle and Follicles.