Document Detail

Effects of calcium salts of fatty acids and protein source on ruminal fermentation and nutrient flow to duodenum of cows.
MedLine Citation:
PMID:  1654345     Owner:  NLM     Status:  MEDLINE    
Four Holstein cows fitted with ruminal and duodenal cannulas were used in a 4 x 4 Latin square to investigate the effects of calcium salts of long-chain fatty acids (fat) and source of protein (fish meal or soybean meal) on ruminal fermentation, flow of nutrients to the small intestine, and animal performance. Cows were fed for ad libitum intake a diet of 30% alfalfa haylage, 20% corn silage, and 50% concentrate on a DM basis. Treatments, arranged in a 2 x 2 (fat x protein) factorial, were 1) soybean meal, no fat; 2) soybean meal, fat; 3) fish meal, no fat; and 4) fish meal, fat. Intake of DM was not affected by fat or protein source, but feeding fat decreased the amount of OM truly digested in the rumen. Starch intake was decreased, but flow of starch to the duodenum was not altered by feeding fat. Nonammonia N and microbial N flows to the duodenum were not affected by treatment comparisons. However, efficiency of microbial growth was increased by feeding fat, but not by source of protein. Passage of amino acids to the duodenum was not affected by source of protein, probably because fish meal contributed only 17% of the total dietary CP, and microbial N constituted about 50% of the NAN passing to the duodenum; this had an equalizing effect on the pattern and quantity of amino acids that passed to the duodenum. Feeding fat or different sources of protein did not alter milk production. Milk fat percentage was increased, and protein percentage was decreased when fat was fed, but yields of milk fat and protein were not different.
T H Klusmeyer; G L Lynch; J H Clark; D R Nelson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  74     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1991 Jul 
Date Detail:
Created Date:  1991-10-24     Completed Date:  1991-10-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2206-19     Citation Subset:  IM    
Department of Animal Sciences, University of Illinois, Urbana 61801.
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MeSH Terms
Amino Acids / administration & dosage,  metabolism
Animal Feed
Calcium / metabolism
Cattle / physiology*
Dietary Fiber / administration & dosage
Dietary Proteins / metabolism*
Duodenum / physiology
Fatty Acids / metabolism*
Fatty Acids, Volatile / analysis
Fish Products
Hydrogen-Ion Concentration
Milk / chemistry,  secretion
Rumen / chemistry,  physiology*
Reg. No./Substance:
0/Amino Acids; 0/Dietary Proteins; 0/Fatty Acids; 0/Fatty Acids, Volatile; 7440-70-2/Calcium

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

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