Liebal, Katja Department of Comparative Cultural Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society. Amici, Federica Department of Comparative Cultural Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society. Soben, C. International Journal of Primatology, 44 5 Include files Advanced Search Browse. START BASKET 0 Tools. ITEM ACTIONS EXPORT. Add to Basket. Local Tags Release History Details Summary. External Resource. Fulltext restricted access. Fulltext public. Supplementary Material public. In many mammal species, mothers are crucial for the survival and development of young offspring. We assessed whether maternal investment is biased toward sons compared with daughters and which factors modulate this relation. We studied 20 mother—offspring dyads, measuring the time mothers spent in body contact, nursing, carrying, grooming, and playing with their offspring, for a total of focal samples from February to July We then ran generalized linear mixed models to assess how these responses varied depending on the two-way interactions of offspring sex with offspring age, maternal age, and maternal centrality. Our results showed that mothers were more likely to nurse, carry, and have body contact with younger than older offspring, regardless of their sex. Older mothers, in particular, were more likely to carry sons than daughters, whereas the contrary was true for younger mothers. Moreover, socially more central mothers were more likely to be in body contact with sons than daughters. Overall, our study shows that some maternal behaviours are sex-biased in male-philopatric Sexy Mom Blowjob Joung Boy, although maternal experience and social integration may modulate this relation.
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