Abstract

Maternal periconceptional undernutrition alters fetal hypothalamic-pituitary-adrenal (HPA) axis development However the effects of this early nutritional insult on postnatal HPA axis function and stress-related behaviours are unknown We investigated in sheep the effects of different periods of undernutrition and of sex and litter size on offspring behavioural and cortisol responses to isolation stress We studied four nutritional groups controls well nourished throughout pregnancy (n = 39) or ewes undernourished (UN 10-15% body weight reduction) before mating ( 60 to 0 d n = 26) after mating ( 2 to + 30 d n = 20) or both (-60 to + 30 d n = 36) At 4 and 18 months of age offspring were isolated for 5 min their behaviour video recorded and plasma cortisol concentrations measuredOffspring of all undernourished groups demonstrated 50% fewer escape attempts than controls at 4 months of age and offspring of UN-60 + 30 ewes had 20% lower plasma cortisol area under the curve in response to isolation at 18 months Females had higher cortisol concentrations and vocalised more than males at 4 and 18 months and were more active at 18 months After isolation UN-2 + 30 males had higher cortisol concentrations than UN-2 + 30 females whereas in all other groups males had lower concentrations than females Singleton males made more escape attempts than females whereas in twins females made more escape attempts than malesThese findings suggest that maternal periconceptional undernutrition in sheep can suppress behavioural reactions and cortisol secretion in response to isolation stress in the offspring into adulthood and that these effects differ between males and females (C) 2010 Elsevier Inc All rights reserved

Keywords

Sheep; Prenatal undernutrition; Social isolation; Cortisol; Behaviour; Stress

Published in

Physiology and Behavior
2010, Volume: 101, number: 5, pages: 588-594

UKÄ Subject classification

Animal and Dairy Science


Publication identifier

DOI: https://doi.org/10.1016/j.physbeh.2010.08.020

Permanent link to this page (URI)

https://res.slu.se/id/publ/86371