Effect of Irradiation on Lactating Animals:I. Effect of Whole-body γ-Irradiation on Lactating Rat and Suckling Young

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Effects of γ-irradiation on lactating rats and her suckling youngs were studied. Lactating mothers were exposed to γ-ray but suckling youngs were not. Mothers and litters were weighed almost every day to their weaning.Suckling youngs' body weights increased at normal rate for 2 weeks' experiments after 200r irradiation. In 400r or more irradiation, the litter's weight gain were depressed. In 800r irradiation, the litter's weight gains showed a decrease of 140% against the control group on the tenth day.However, mothers' body weights decreased with mere 200r irradiation. Though with 400r or more the weights decreased, it had seen some increase period in the first week. In the case of 800r, their weights decreased rapidly and all of them died in 10 days. In all cases, the mother's death was followed by her suckling young's death.These results suggested that the effect of γ-irradiation on animals included two independent effects. These were the effect on mother's growth and that on lactation. In this experiment, the effect on a mother's growth was stronger than that on her mammary gland.Whole-body irradiation of 800r on lactating mothers could not stop their lactation completely till the day of mothers' deaths.
公益社団法人日本畜産学会の論文