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Animal Bioresource in Japan

.: Home > Animal Bioresource in Japan > 2015 > Volume 64 Number 4 > Shinichi Iwasaki and Koki Inoue

Maternal-infant separation impedes changes in feeding behavior during estrous cycle of rats

Shinichi Iwasaki and Koki Inoue
Department of Neuropsychiatry, Osaka City University Graduate School of Medicine, 1-4-3 Asahi-machi, Abenoku, Osaka 545-8585, Japan
Abstract :

Traumatic and stressful events during childhood are associated with the development of eating disorders. We conducted an animal study to test if association stress in childhood affects ingestive behavior later in life by using female rats that have an adjusted estrous cycle. First, electrical impedance of the vagina was conducted to test estrous cycle adjustment. Second, the effects of 6 h per day maternal separation from birth to weaning, which models a psychologically stressful experience in childhood, was used to test feeding behavior during an ovarian cycle in female adult rats with matched estrous cycles. Food and water intake in maternal separated and non-separated rats was measured in each estrous phase. Non-separated rats showed periodical changes, but maternal separated rats showed no significant changes in food and water intake during an estrous cycle. An opposing tendency for food and water intake was seen between maternal separated and nonseparated rats. These observations suggest that electrical impedance of the vagina showed the highest value in the estrous phase of rats housed in a reversed light-dark cycle, and maternal separation was found to disturb changes in feeding behavior during the estrous cycle.

Keywords :
eating disorders, electrical impedance of the vagina, estrous cycle, female rat, maternal separation

Date Deposited : 07 Jan 2016 11:13

Last Modified : 07 Jan 2016 11:13

Official URL: http://https://www.jstage.jst.go.jp/browse/expanim/64/4/_contents

Volume 64, Number 4, June 2015 , ISSN 383–390

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