High oxytocin infants gain more mass with no additional maternal energetic costs in wild grey seals (Halichoerus grypus)
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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.
Robinson , K J , Hazon , N , Twiss , S & Pomeroy , P 2019 , ' High oxytocin infants gain more mass with no additional maternal energetic costs in wild grey seals ( Halichoerus grypus ) ' , Psychoneuroendocrinology , vol. 110 , 104423 . https://doi.org/10.1016/j.psyneuen.2019.104423
Copyright © 2019 Elsevier Ltd. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.psyneuen.2019.104423
DescriptionThe UK’s Natural Environmental Research Council (NERC) funded the long-term program of research on grey seals at North Rona and the Isle of May. PPP and SDT were in receipt of NERC grant NE/G008930/1 and PPP was in receipt of Esmée Fairburn Foundation grant 08-1037 during the work. This paper formed part of KJR’s PhD funded by the UK Natural Environment Research Council (NERC) grant NE/H524930/1 and by SMRU Marine, St Andrews, UK.
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