Journal Article <論文・報告>ニホンザル乳児の授乳時における乳首の選好性について

金沢, 優真

1pp.17 - 19 , 2016-03 , 京都大学学際融合教育研究推進センター高大接続科学教育ユニット
理学 人類進化論
Infants of several primate species show nipple preference in their youth. Little is known, however, about when and how the laterality in nipple preference develops. I observed and analysed nipple suckling behavior in infant Japanese macaques (Macaca fuscata) to identify factors which influence laterality in nipple preference. I observed four mother-infant pairs in Arashiyama Monkey Park. I recorded the infants’ nipple suckling behavior and the lying down posture of the mothers, as well as their activities as mother-infant pairs. Three of the four pairs showed the development of significant nipple preference during 10–15 days of age of the infant. Contrary to expectations, activities performed by the mother, such as grooming, moving, sitting, lying down, and feeding, did not appear to affect infant nipple preference. These results suggest that nipple preference may be fixed at 10– 15 days of age, although it is likely to be influenced by the difference in milk secretion between nipples or laterality of the mother’s hand when supporting an infant. Longer and more intensive observations are required to answer these questions.

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