Document Detail

Conjugated linoleic acid and other beneficial fatty acids in milk fat from cows fed soybean meal, fish meal, or both.
MedLine Citation:
PMID:  11518309     Owner:  NLM     Status:  MEDLINE    
Twelve multiparous Holstein cows at 48 +/- 8 DIM were used in a 4 x 4 Latin square with 21-d periods to determine the effect of replacing soybean meal with fish meal on feed intake, milk yield, and milk composition. Fish meal substituted for soybean meal on an isonitrogenous basis at 0, 25, 50, and 100% of supplemental protein. Total mixed diets were (DM basis) 25% corn silage, 25% alfalfa hay, and 50% concentrate mix. Intake of DM (27.9, 27.8, 26.1, and 25.8 kg/d for diets 1 to 4, respectively) was similar for all diets. Milk yield (37.5, 37.8, 37.2, and 37.7 kg/d) was not affected by diets. Milk protein percentages (3.23, 3.24, 3.31, and 3.35) increased with 100% fish meal supplementation and tended to be higher with 50% fish meal supplementation compared with 100% soybean meal diet. Milk fat percentages (3.18, 2.99, 3.04, and 2.87) and yield were lower with the 100% fish meal than with the 100% soybean meal diet. Concentration of n-3 fatty acids in milk fat (0.54, 0.56, 0.63, and 0.72 g/100 g fatty acids) increased as the proportion of fish meal in the diet increased. Concentrations of c9,t11 conjugated linoleic acid (CLA; 0.39, 0.44, 0.46, and 0.72 g/100 g fatty acids) and transvaccenic acid (TVA; 1.09, 1.19, 1.28, and 1.54 g/100 g of fatty acids) were higher with the 100% fish meal diet than with the 100% soybean meal diet. A total replacement of soybean meal with fish meal in the diet of lactating cows increased milk protein percentages and the beneficial fatty acids (CLA, TVA, and n-3 FA) in milk fat.
A A Abu-Ghazaleh; D J Schingoethe; A R Hippen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  84     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2001 Aug 
Date Detail:
Created Date:  2001-08-23     Completed Date:  2002-01-24     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:  1845-50     Citation Subset:  IM    
Dairy Science Department, South Dakota State University, Brookings, 57007-0647, USA.
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MeSH Terms
Animal Feed / analysis*
Cattle / metabolism,  physiology*
Dietary Proteins / administration & dosage
Fatty Acids, Unsaturated / analysis
Fish Products
Lactation / metabolism*,  physiology
Linoleic Acid / analysis*
Lipids / analysis
Milk / chemistry*
Milk Proteins / analysis
Soybeans / metabolism
Reg. No./Substance:
0/Dietary Proteins; 0/Fatty Acids, Unsaturated; 0/Lipids; 0/Milk Proteins; 2197-37-7/Linoleic Acid

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