The effect of maternal undernutrition in early gestation on gestation length and fetal and postnatal growth in sheep.
In utero undernutrition in humans may result in cardiovascular (CV), metabolic, and growth adaptations. In sheep, maternal nutrient restriction during pregnancy, without effects on fetal or birth weight, results in altered CV control in the offspring. Adjustment of gestation length after undernutrition could be a strategy to enhance postnatal health/survival. The aim of this study was to determine in sheep the effect of a 50% reduction in maternal nutrient intake [undernutrition group (U) versus 100%, control group (C)] during 1-31 d of gestation (dGA) on gestation length and offspring size. By 28 dGA, U ewes had gained less weight than C, and twin-bearing ewes had gained less weight than singleton-bearing ewes regardless of group (p<0.05). In different-sex twin pairs, maternal undernutrition resulted in longer gestation compared with C (146.5+/-0.6 versus 144.6+/-0.6 d, p<0.05). Increased weight gain by weaning (20.8+/-0.8 versus 17.9+/-0.8 kg, p<0.05) was observed in U male twins. These findings suggest that the strategy (i.e. growth rate or length of time in utero) adopted by the fetus to enhance immediate survival depends on offspring number and sex. This is likely to reflect the degree of constraint imposed on the fetus.
Cleal
Jane K
JK
Centre for Developmental Origins of Health and Disease, University of Southampton, Southampton, SO16 5YA United Kingdom. jcleal@soton.ac.uk
Poore
Kirsten R
KR
Newman
James P
JP
Noakes
David E
DE
Hanson
Mark A
MA
Green
Lucy R
LR
D000324:Adrenocorticotropic Hormone / Q000097:blood; D000818:Animals; D001724:Birth Weight; D001835:Body Weight; D002318:Cardiovascular Diseases / Q000196:embryology* / Q000503:physiopathology; D005260:Female; D048070:Fetal Nutrition Disorders / Q000209:etiology* / Q000473:pathology / Q000503:physiopathology; D020567:Fetal Weight; D005865:Gestational Age; D006854:Hydrocortisone / Q000097:blood; D053208:Kaplan-Meier Estimate; D008297:Male; D044342:Malnutrition / Q000150:complications* / Q000473:pathology / Q000503:physiopathology; D009929:Organ Size; D010920:Placenta / Q000473:pathology; D011247:Pregnancy; D039401:Prenatal Nutritional Physiological Phenomena; D012756:Sheep; D014427:Twins
D000324:Adrenocorticotropic Hormone; D006854:Hydrocortisone