Placental and fetal growth restriction, size at birth and neonatal growth alter cognitive function and behaviour in sheep in an age- and sex-specific manner

Abstract Intrauterine growth restriction and slow neonatal growth in humans are each associated with poorer learning, memory and cognitive flexibility in childhood and adulthood. The relative contributions of pre- and post-natal growth to cognitive outcomes are unclear, however. We therefore compare...

Full description

Saved in:
Bibliographic Details
Published inPhysiology & behavior Vol. 152; no. Pt A; pp. 1 - 10
Main Authors Hunter, Damien S, Hazel, Susan J, Kind, Karen L, Liu, Hong, Marini, Danila, Giles, Lynne C, De Blasio, Miles J, Owens, Julie A, Pitcher, Julia B, Gatford, Kathryn L
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 01.12.2015
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary:Abstract Intrauterine growth restriction and slow neonatal growth in humans are each associated with poorer learning, memory and cognitive flexibility in childhood and adulthood. The relative contributions of pre- and post-natal growth to cognitive outcomes are unclear, however. We therefore compared performance in learning, memory and reversal tasks using a modified Y-maze at 18 and 40 weeks of age in offspring of placentally-restricted (PR: 10 M, 13 F) and control (23 M, 17 F) ovine pregnancies. We also investigated relationships between size at birth, neonatal growth rates and cognitive outcomes. PR had limited effects on cognitive outcomes, with PR males requiring more trials to solve the initial learning task than controls (P = 0.037) but faster completion of reversal tasks in both sexes at 18 weeks of age. In males, neonatal growth rate correlated inversely with numbers of trials and total time required to solve memory tasks at 40 weeks of age. In females, bleat frequency in the first reversal task at 18 weeks of age correlated positively with birth weight (r = 0.734, P < 0.05) and neonatal growth rate (r = 0.563, P < 0.05). We conclude that PR induces limited effects on cognitive outcomes in sheep, with some evidence of impaired learning in males, but little effect on memory or cognitive flexibility in either sex. Rapid neonatal growth predicted improved memory task performance in males, suggesting that strategies to optimize neonatal growth may have long-term cognitive benefits but that these may be sex-specific.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0031-9384
1873-507X
DOI:10.1016/j.physbeh.2015.08.042