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Effect of variable long-term maternal feed allowance on the development of the ovine placenta and fetus.
- Source :
-
Placenta [Placenta] 2008 Jun; Vol. 29 (6), pp. 539-48. Date of Electronic Publication: 2008 Apr 15. - Publication Year :
- 2008
-
Abstract
- Maternal feed allowance during pregnancy can affect the development of the ovine placenta and fetus. The impact of variations in feed allowance prior to as well as throughout pregnancy has received less attention. Ewes were offered 0.6 (R), 1.2 (C) or 1.8 (AL) maintenance requirements from 89 days before conception until day 133 of pregnancy. Ewes were euthanised on days 50, 92 and 133 of pregnancy. Ewe live weight and body condition score, maternal and fetal metabolic and hormonal profiles, fetal body dimensions and organ weights, and the number, weight and morphology of placentomes were measured. Maternal live weight and condition score were lower in R compared to AL ewes at all stages of pregnancy (P<0.05). Plasma glucose and albumin concentrations of R ewes were significantly reduced (P<0.05) at mid and late gestation, respectively. Placental components were generally unresponsive to long term variations in maternal feed allowance. However, placental weight was significantly (P<0.05) correlated with fetal weight at days 50 (r=0.59) and 133 (r=0.69) of gestation. By late gestation growth-retarded singleton fetuses from R ewes were 19% lighter (P<0.05), with reduced abdominal (9%) and thoracic (10%) girths (P<0.05) but of similar crown-rump length compared with fetuses from AL ewes. These differences were associated with significantly reduced IGF-I concentrations in fetal plasma (P<0.05). In conclusion, maternal, placental and fetal adaptations to long established planes of variable maternal feed allowance were able to maintain fetal growth during early and mid-pregnancy while fetal growth restriction, associated with reduced fetal IGF-I levels, became apparent in late pregnancy.
- Subjects :
- Animal Nutritional Physiological Phenomena physiology
Animals
Blood Glucose metabolism
Body Constitution physiology
Body Weight
Fatty Acids, Nonesterified blood
Female
Fetal Weight
Maternal-Fetal Exchange physiology
Muscles anatomy & histology
Muscles embryology
Organ Size
Pregnancy
Sheep metabolism
Time Factors
Urea blood
Animal Feed
Fetal Development physiology
Maternal Nutritional Physiological Phenomena physiology
Placentation
Pregnancy, Animal
Sheep physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0143-4004
- Volume :
- 29
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Placenta
- Publication Type :
- Academic Journal
- Accession number :
- 18417210
- Full Text :
- https://doi.org/10.1016/j.placenta.2008.02.014