Document Detail

Influence of dietary protein sources on the amino acid profiles available for digestion and metabolism in lactating cows.
MedLine Citation:
PMID:  2273149     Owner:  NLM     Status:  MEDLINE    
Six lactating Holstein cows, fitted with T-type cannulas in the proximal duodenum, were used in a replicated 3 x 3 Latin square design to determine influence of supplemental protein on amino acid profiles of duodenal chyme and plasma. Protein sources were blood meal, corn gluten meal, and cottonseed meal, which furnished approximately 46% of the total protein in corn-grain corn silage diets. Markers were 15N to estimate rumen bacteria and chromic oxide to estimate nutrient flow. Dry matter intake was lowest on blood meal. Duodenal flow of N exceeded N intake 23% on blood meal and corn gluten meal. Percentages of organic matter and protein digested in the rumen were 56.5, 41.8; 61.2, 53.4; and 50.6, 56.2 for the respective diets. Variation in patterns of amino acids flowing to the duodenum, but not in coccygeal blood, closely reflected dietary differences with six of eight essential amino acids highest for the same treatment in both diet and duodenal chyme. Essential amino acids in least abundance for milk production, measured by mammary extraction coefficients, differed among diets. We conclude that supplemental protein source influences greatly the quantity and pattern of amino acids available for digestion in lactating dairy cows.
K J King; J T Huber; M Sadik; W G Bergen; A L Grant; V L King
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  73     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1990 Nov 
Date Detail:
Created Date:  1991-02-28     Completed Date:  1991-02-28     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  3208-16     Citation Subset:  IM    
Department of Animal Sciences, University of Arizona, Tucson 85721.
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MeSH Terms
Amino Acids / metabolism*
Animal Feed
Cattle / metabolism*
Dietary Proteins / metabolism*
Lactation / metabolism*
Nitrogen / metabolism
Rumen / metabolism
Reg. No./Substance:
0/Amino Acids; 0/Dietary Proteins; 7727-37-9/Nitrogen

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

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