Studies on the maternal behavior in the mouse

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  • SAITO Toru R
    Toxicology Division, The Institute of Environmental Toxicology
  • TAKAHASHI Kazuaki W
    Toxicology Division, The Institute of Environmental Toxicology Laboratory of Laboratory Animal Science

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Other Title
  • マウスの母性行動に関する研究
  • マウス ノ ボセイ コウドウ ニカンスルケンキュウ 1 ヨウジャクキ カラ コ
  • I. The maternal behavior from immature to senile age
  • I.幼若期から高齢期に至るまでの母性行動の観察成績

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Abstract

The maternal behavior was studied using IVCS strain mice aged from 24 to 550 days. Three hundred and thirty-four females and one hundred males were used for this experiment. The animals had never been in contact with any pups except for their own litter-mates prior to the experiment. They were housed individually in standard cages and a standard maternal behavior test was started when a 1-or 2-day-old pup was placed about 10 cm distant from the nest. The maternal behavior of each test animal was observed for 5 minutes after contact with the pup. Retrieving and licking the pup, nest-building and adoption of the lactation-position were recorded.<BR>The results obtained were as follows; 1) Mice of both sexes aged 24 to 25 days already showed normal maternal behavior. The ratio of abnormal maternal behavior in mice of both sexes aged 550 days were higher than that in younger ages. 2) The ratio of complex maternal behavior in mice of both sexes aged 70 to 84 days and 280 days were higher than that in other ages. 3) Licking was always shown first in the animals aged 70 to 84 days except one female.

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