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Micrencephalic neonatal pups were obtained from pregnant Crj:CD (SD) rats once treated with 5 mg/kg of N-methyl-N-nitrosourea (MNU) or 40 mg/kg of methylazoxymethanol (MAM) on day 12, 13, 14 or 15 of gestation (vaginal plug = day 0). They were reared by their own mothers and were subjected to various neurobehavioral tests during the suckling period, days 0 to 22 after birth. The brain weights in the MNU- and MAM-treated pups on postnatal day 22 were significantly less than those in the control pups. These micrencephalic pups were retarded in neurobehavioral ontogeny. By several tests, each of them showed an impaired performance such as paired limb movement, clumsy locomotion or hyperreflexive reaction. These behavioral disorders appeared different according to the day of treatment, without any substantial difference between the test compounds, MNU and MAM. The findings suggest that the different neurobehavioral characteristics in the micrencephalic pups may reflect their different brain disorders induced by the test compounds given on the different period of the treatment.

journal of veterinary medical science

Early Neurobehavioral Disorders in the Micrencephalic Offspring Induced by Prenatal Treatment with N-Methyl-N-Nitrosourea or Methylazoxymethanol in the Rat.