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Placental restriction in multi-fetal pregnancies and between-twin differences in size at birth alter neonatal feeding behaviour in the sheep

Published online by Cambridge University Press:  06 April 2017

R. F. Peter ,
J. Gugusheff ,
A. L. Wooldridge Open the ORCID record for A. L. Wooldridge [Opens in a new window] ,
K. L. Gatford Open the ORCID record for K. L. Gatford [Opens in a new window]  and
B. S. Muhlhausler
R. F. Peter
Affiliation:
Department of Food and Wine Science, School of Agriculture, Food and Wine, FOODplus Research Centre, The University of Adelaide, Adelaide, SA, Australia
J. Gugusheff
Affiliation:
Department of Food and Wine Science, School of Agriculture, Food and Wine, FOODplus Research Centre, The University of Adelaide, Adelaide, SA, Australia
A. L. Wooldridge
Affiliation:
Discipline of Obstetrics and Gynaecology, Adelaide Medical School, Adelaide, SA, Australia Robinson Research Institute, The University of Adelaide, Adelaide, SA, Australia
K. L. Gatford
Affiliation:
Discipline of Obstetrics and Gynaecology, Adelaide Medical School, Adelaide, SA, Australia Robinson Research Institute, The University of Adelaide, Adelaide, SA, Australia
B. S. Muhlhausler*
Affiliation:
Department of Food and Wine Science, School of Agriculture, Food and Wine, FOODplus Research Centre, The University of Adelaide, Adelaide, SA, Australia
*
*Address for correspondence: B. S. Muhlhausler, FOODplus Research Centre, The University of Adelaide, Adelaide, South Australia 5064, Australia. (Email beverly.muhlhausler@adelaide.edu.au)
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Abstract

Most individuals whose growth was restricted before birth undergo accelerated or catch-up neonatal growth. This is an independent risk factor for later metabolic disease, but the underlying mechanisms are poorly understood. This study aimed to test the hypothesis that natural and experimentally induced in utero growth restriction increase neonatal appetite and milk intake. Control (CON) and placentally restricted (PR) ewes carrying multiple fetuses delivered naturally at term. Outcomes were compared between CON (n=14) and PR (n=12) progeny and within twin lamb pairs. Lamb milk intake and feeding behaviour and ewe milk composition were determined using a modified weigh-suckle-weigh procedure on days 15 and 23. PR lambs tended to have lower birth weights than CON (−15%, P=0.052). Neonatal growth rates were similar in CON and PR, whilst heavier twins grew faster in absolute but not fractional terms than their co-twins. At day 23, milk protein content was higher in PR than CON ewes (P=0.038). At day 15, PR lambs had fewer suckling bouts than CON lambs and in females light twins had more suckling attempts than their heavier co-twins. Birth weight differences between twins positively predicted differences in milk intakes. Lactational constraint and natural prenatal growth restriction in twins may explain the similar milk intakes in CON and PR. Within twin comparisons support the hypothesis that prenatal constraint increases lamb appetite, although this did not increase milk intake. We suggest that future mechanistic studies of catch-up growth be performed in singletons and be powered to assess effects in each sex.

Keywords

catch-up growthfetal growth restrictionmilk compositionmilk intakenewborn
Type
Original Article
Information
Journal of Developmental Origins of Health and Disease , Volume 8 , Issue 3 , June 2017 , pp. 357 - 369
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Copyright
© Cambridge University Press and the International Society for Developmental Origins of Health and Disease 2017 

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Footnotes

†

Joint senior authors.

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