Document Detail

Dietary protein during gestation affects circulating indicators of placental function and fetal development in heifers.
MedLine Citation:
PMID:  19233467     Owner:  NLM     Status:  MEDLINE    
The influences of nutritional protein during the first and second trimesters of pregnancy on placental hormones and fetal growth were determined in composite beef heifers. At artificial insemination, heifers were stratified by weight within each composite genotype into 4 treatment groups: High High (HH=1.4kg crude protein (CP)/day for first and second trimesters of gestation; n=16), High Low (HL=1.4kg CP/day for first trimester and 0.4kg CP/day for second trimester; n=19), Low High (LH=0.4kg CP/day for first trimester and 1.4kg CP/day for second trimester; n=17) or Low Low (LL=0.4kg CP/day for first and second trimesters; n=19). Maternal plasma bovine pregnancy associated glycoprotein (bPAG) and progesterone (P4) were determined at gestation day (gd) 28, 82, 179 and 271 (mean gestation length 286 days) in addition to P4 at term. Estrone sulphate (ES) and bovine placental lactogen (bPL) concentrations were measured at gd 124, 179, 236 and 271 and at term in addition to ES at gd 82. Low dietary protein increased placental function as indicated by increased bPAG (P<0.001) and ES (P=0.02) concentrations in first trimester and increased bPL concentrations (P=0.01) in the second trimester of gestation. In the third trimester, when dietary treatment had ceased, placental function was no longer associated with previous dietary treatments. Dam genotype affected placental function as measured by bPL (P<0.001) and ES concentrations (P=0.02). Calf gender, heifer age and maternal insulin-like growth factor (IGF)-I, -II and leptin did not affect hormonal indicators or circulating markers of placental function. Enhanced placental function during the third trimester, as measured by ES, was associated with increased calf birth weight (P=0.003).
T M Sullivan; G C Micke; R S Magalhaes; G B Martin; C R Wallace; J A Green; V E A Perry
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-02-23
Journal Detail:
Title:  Placenta     Volume:  30     ISSN:  0143-4004     ISO Abbreviation:  Placenta     Publication Date:  2009 Apr 
Date Detail:
Created Date:  2009-03-23     Completed Date:  2009-06-24     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8006349     Medline TA:  Placenta     Country:  England    
Other Details:
Languages:  eng     Pagination:  348-54     Citation Subset:  IM    
School of Veterinary Science, The University of Queensland, St Lucia, QLD 4072, Australia.
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MeSH Terms
Animal Nutritional Physiological Phenomena
Animals, Newborn
Aspartic Acid Endopeptidases / blood
Dietary Proteins / administration & dosage*
Estrone / analogs & derivatives,  blood
Fetal Development / physiology*
Leptin / blood
Placenta / physiology*
Placental Lactogen / blood
Pregnancy Proteins / blood
Pregnancy, Animal / blood*
Progesterone / blood
Somatomedins / metabolism
Reg. No./Substance:
0/Dietary Proteins; 0/Leptin; 0/Pregnancy Proteins; 0/Somatomedins; 481-97-0/estrone sulfate; 53-16-7/Estrone; 57-83-0/Progesterone; 9035-54-5/Placental Lactogen; EC 3.4.23.-/Aspartic Acid Endopeptidases; EC 3.4.23.-/pregnancy-associated glycoprotein 1

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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