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High oxytocin infants gain more mass with no additional maternal energetic costs in wild grey seals (Halichoerus grypus)

Robinson, Kelly J.; Hazon, Neil; Twiss, Sean D.; Pomeroy, Patrick P.

High oxytocin infants gain more mass with no additional maternal energetic costs in wild grey seals (Halichoerus grypus) Thumbnail


Kelly J. Robinson

Neil Hazon

Patrick P. Pomeroy


Maximising infant survival requires secure attachments and appropriate behaviours between parents and offspring. Oxytocin is vital for parent-offspring bonding and behaviour. It also modulates energetic balance and neural pathways regulating feeding. However, to date the connections between these two areas of the hormone’s functionality are poorly defined. We demonstrate that grey seal (Halichoerus grypus) mothers with high oxytocin levels produce pups with high oxytocin levels throughout lactation, and show for the first time a link between endogenous infant oxytocin levels and rates of mass gain prior to weaning. High oxytocin infants gained mass at a greater rate without additional energetic cost to their mothers. Increased mass gain in infants was not due to increased nursing, and there was no link between maternal mass loss rates and plasma oxytocin concentrations. Increased mass gain rates within high oxytocin infants may be due to changes in individual behaviour and energy expenditure or oxytocin impacting on tissue formation. Infancy is a crucial time for growth and development, and our findings connect the oxytocin driven mechanisms for parent-infant bonding with the energetics underlying parental care. Our study demonstrates that oxytocin release may connect optimal parental or social environments with direct physiological advantages for individual development.

Journal Article Type Article
Acceptance Date Aug 26, 2019
Online Publication Date Aug 27, 2019
Publication Date Dec 1, 2019
Deposit Date Oct 3, 2019
Publicly Available Date Aug 27, 2020
Journal Psychoneuroendocrinology
Print ISSN 0306-4530
Publisher Elsevier
Peer Reviewed Not Peer Reviewed
Volume 110
Article Number 104423
Public URL


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