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

Damien Hunter, Susan J. Hazel, Karen L. Kind, Hong Liu, Danila Marini, Lynne C. Giles, Miles J. De Blasio, Julie A. Owens, Julia B. Pitcher, Kathryn L. Gatford

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalPhysiology and Behavior
Volume152
DOIs
Publication statusPublished - 1 Dec 2015

Keywords

  • Birth weight
  • Cognition
  • IUGR
  • Maze
  • Neonatal growth
  • Sheep

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Behavioral Neuroscience

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