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Lactating dams and maternal virgin females are less fearful in behavioral tests compared with non-maternal animals, suggesting that maternal condition per se reduces the negative value of threatening stimuli. In addition, lactating females exhibit a diminished hypothalamic–pituitary–adrenal response to potential environmental threats. Can the maternal condition, independently of the endocrine profile...
This study demonstrates changes in experimental anxiety assessed in the black and white paradigm during various reproductive states of female rats. Low levels of experimental anxiety were observed during late proestrus and on day 17 of gestation, stages related to high progesterone (P) levels. In estrus, metestrus, diestrus and on day 21 of gestation, stages characterized by low P concentrations,...
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