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The Human Mammary Odour Factor: Variability and Regularities in Sources and Functions

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Chemical Signals in Vertebrates 14

Abstract

In the course of evolution, human mothers have been, and still are, under strong selective pressure to induce their newborns’ colostrum ingestion promptly after birth. As a concentrate of nutrients, passive immunity, antioxidants, growth factors and symbiotic microbiota, colostrum functions as the evolved antidote to ubiquitous pathogens and threats of neonatal exhaustion. Under such constraints, any means to speed up colostrum/milk intake can only have been beneficial to neonatal viability and adaptive life onset along evolutionary time. The areolar-nipple areas of human lactating females emit lacteal substrates conveying chemostimuli that are attractive and release mouthing and sucking in infants. Current information about areolar glands of Montgomery is summarized here, in terms of variability/regularity in number and distribution, of behavioural activity of their secretion, and of the adaptive value of their occurrence. It is concluded that a majority of lactating women investigated so far bear from 1 to >40 glands/areola, among which some emit a visible secretion. Reciprocally, a majority of neonate infants react to the odour of these secretions. The number of areolar glands correlates with infants’ behaviour at the breast, indicating that areolar phenotypic variability has potential fitness consequences on the infant and the mother. Ideas for future studies are outlined to advance our understanding of how human areolar phenotypic variability relates to life history characteristics.

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Acknowledgements

The Centre National de la Recherche Scientifique (CNRS), the Regional Council of Bourgogne-Franche-Comté, and ANR grant “Milkodor” 15-CE21-0009-01 (to BS) supported the writing of this chapter. The authors gratefully thank Tristram D. Wyatt and Elisabeth III Hertling for useful comments on an earlier draft.

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Schaal, B., Doucet, S., Soussignan, R., Klaey-Tassone, M., Patris, B., Durand, K. (2019). The Human Mammary Odour Factor: Variability and Regularities in Sources and Functions. In: Buesching, C. (eds) Chemical Signals in Vertebrates 14. Springer, Cham. https://doi.org/10.1007/978-3-030-17616-7_10

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