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The effects of exposure of pregnant rats to a 60 Hz magnetic field on fertility and health of dams and teratogenic effects in fetuses should be investigated.
Mated female rats were divided into 4 groups (n=24 each): exposure to a magnetic field of 1) 5 µT, 2) 83.3 µT, 3) 500 µT and 4) sham exposure. On gestational day 20, all rats were anesthetized, Caesarean sections were conducted and dams and fetuses were investigated.
fertility and health of mother rats and teratogenicity in fetuses
field generator consisted of four square coils and one rack (1.8 m x 1.8 m x 1.8 m) with three animal living floors with more than 10 animals per floor in individual cages; magnetic field variation within the animal testing area was less than 3%; room maintained a temperature of 22 ± 3°C and a relative humidity of 50 ± 10%
胚／胎児への影響: visceral and skeletal malformations and variations in fetuses, numbers of dead fetuses and live male/female fetuses, body weight of fetuses
生殖系への影響: fertility parameters in dams: numbers of pregnant animals, corpora lutea, implantations and early and late resorptions, weight of placenta, litter size
免疫系への影響: blood count in dams: number of total white blood cells, red blood cells and platelets, concentration of hemoglobin, hematocrit, mean corpuscular volume, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration (automatic cell counter), number of neutrophils, lymphocytes, monocytes, eosinophils, basophils (blood film, Wright's method stain, microscopy), prothrombin time (semiautomatic analyzer)
general health parameters in dams: mortality, food consumption, body weight, weight of brain, adrenal glands, liver, spleen, kidneys, heart and ovaries; biochemical parameters in serum from dams: enzyme activities of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, amounts of blood urea nitrogen, creatinine, glucose, total cholesterol, total bilirubin, total protein, albumin, creatine phosphokinase, triglycerides, calcium, inorganic phosphorus, phospholipid, globulin, sodium, potassium, chloride (automatic analyzer)
No significant differences were found between the exposure groups (groups 1-3) and the sham exposure group. The authors conclude that exposure of pregnant rats to a 60 Hz magnetic field has no effects on fertility and health of dams and no teratogenic effects in fetuses.