ラットの離乳に及ぼす連続出産による母性状態維持の効果<SUP>1</SUP>

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  • Influence of sustained maternal state induced by successive mating upon weaning of rats
  • ラット ノ リニュウ ニ オヨボス レンゾク シュッサン ニ ヨル ボセイ ジ

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Influence of sustained maternal state upon weaning of rats was studied in successive litters produced by postpartum mating. In preliminary experiment, the mother's behavior during pre- and postpartum period of the 2nd litter were examined using within-subject design. Results showed that frequency of nursing decreased, while that of eating and drinking increased. But frequency of nursing increased after the delivery of the 2nd litter, indicating the restored maternal state. In the experiments, the behavior of mother and pups were compared between the mothers with successive litter and those only with the 1st litter. Suckling of the 1st litter was maintained longer in the mothers of successive litter group. But eating and drinking was not different between the two groups. These results indicate that the termination of suckling is determined by the decrement of milk supply, but the emergence of eating and drinking is not influenced during weaning period.

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