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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Infanticide in rodents ： ウィキペディア英語版 Infanticide in rodents "Infanticide" is the term used for the termination of a neonate after it has been born, and in zoology this often applies to the termination and/or consumption of newborn animals by either a parent or an unrelated adult. In rodents, it is not uncommon for the mother to commit infanticide shortly after parturition (giving birth) under conditions of extreme stress (parental infanticide), or for an unrelated male to kill neonates (nonparental infanticide). ==Parental infanticide== Parental infanticide is perhaps the most confusing behaviour to understand, as in many cases it can seem maladaptive for a parent to terminate offspring carrying its own genetic material. However, studies in mice have indicated infanticide may be a genetically heritable trait, and may even have a learned element, so there is clearly more to the behaviour than might be expected. The occurrence of infanticide seems to vary within rodent species between parents. For example, male meadow voles and house mice can be classed as either 'infanticidal' or 'non-infanticidal' depending on their history with other litters they have sired, although studies have shown that females do not discriminate between these classes when choosing a mate. Furthermore, recent studies in rodents have shown that infanticide is influenced by various hormones such as: prolactin, corticosterone, and progesterone. Evidence from studies on female cooperative breeding Mongolian gerbils indicated that type of living environment influences hormone concentrations of progesterone, and prolactin. To investigate living environment effects, female gerbils in three housing groups (FH-family housed, PH-pair mate housed, and SH- singly housed) were observed and compared to each other. Unfamiliar pups were placed in a cage with each female to observe any infanticide response. Following the pup test samples of prolactin, and progesterone were taken via blood. Analyses showed that females with lower progesterone (FH group) and prolactin levels rarely displayed infanticidal behavior toward the unfamiliar pup, compared to the females that possessed higher levels, in which they attacked the pup. These results show that cohabitation with family, contributes to lower progesterone and prolactin concentrations in female Mongolian gerbils, which is shown to decrease the likelihood that infanticide will occur.〔3. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Infanticide in rodents」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.