Studies on the maternal behavior in the mouse

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  • SAITO Toru R
    Toxicology Division, The Institute of Environmental Toxi-cology
  • TAKAHASHI Kazuaki W
    Toxicology Division, The Institute of Environmental Toxi-cology 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 2 ボセイ コウドウ ノ
  • II. Difference in the maternalbehavior pattern among different strains
  • II.母性行動のpatternにおける系統差について

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Abstract

Strain difference in the maternal behavior pattern was studied using ICR, C57BL/6, C3H/He and IVCS1) female mice aged from 10 to 12 weeks. The maternal behavior of each test animal was observed for 5 minutes after contact with the pup.<BR>The results obtained were as follows; 1) As to the ratio of initial retrieving, IVCS strain (0.7 %) was significantly lower (p<0.001) than other strains (42.3 to 72.2%). 2) One maternal behavior was observed in ICR (30.8%), C3H/He (5.6%) and IVCS (34.1%), but not in C57BL/6. 3) Four maternal behaviors were observed in ICR (7.7%), C57BL/6 (72.2%) and C3H/He (27.8%), bur not in IVCS. 4) As to the ratio of lactation-position, IVCS strain (0.7%) was significantly lower (p at least <0.01) than others (23.1 to 72.2%).

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