Document Detail

Growth and accretion of energy and protein in the gravid uterus during late pregnancy in Holstein cows.
MedLine Citation:
PMID:  8550905     Owner:  NLM     Status:  MEDLINE    
Multiparous Holstein cows (n = 18) were bred artificially to the same bull and then slaughtered at times ranging from 190 to 270 d postconception to assess accretion of energy, protein, fat, and ash by the conceptus. Wet weights, dry weights, and concentrations of energy, CP, crude fat, and ash were obtained for the following: fetus, combined amniotic and allantoic fluids, fetal membranes, cotyledons, caruncles, and uterine tissues. Rates of accumulation of these components in the gravid uterus (sum of all uterine contents) and fetus were described by linear or quadratic equations. Estimated rates of accretion of energy in the gravid uterus (i.e., conceptus) increased from 567 kcal/d at 190 d of gestation to 821 kcal/d at 270 d of gestation; corresponding rates of accretion of CP were 62 and 117 g/d. These daily rates represent net energy and protein requirements for conceptus growth during late pregnancy in mature Holstein cows. Conversion of predicted net energy to metabolizable energy requirements for conceptus growth, using the accepted efficiency factor of .14, yielded estimates that were consistent with current NRC recommendations. Factorial estimation of absorbed protein requirements is hampered by lack of precise information on the efficiency with which absorbed AA are deposited in conceptus tissues.
A W Bell; R Slepetis; R A Ehrhardt
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  78     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1995 Sep 
Date Detail:
Created Date:  1996-02-20     Completed Date:  1996-02-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1954-61     Citation Subset:  IM    
Department of Animal Science, Cornell University, Ithaca, NY 14853-4801, USA.
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MeSH Terms
Animal Nutritional Physiological Phenomena
Cattle / physiology*
Dietary Proteins / administration & dosage,  metabolism*
Embryonic and Fetal Development
Energy Intake
Energy Metabolism*
Fetus / metabolism
Nutritional Requirements*
Pregnancy, Animal / physiology*
Uterus / metabolism*
Weight Gain*
Reg. No./Substance:
0/Dietary Proteins

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

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