Document Detail


Milk fatty acid composition of grazing dairy cows when supplemented with linseed oil.
MedLine Citation:
PMID:  18218760     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of varying amounts of linseed oil (LSO) in grazing dairy cows' diet on milk conjugated linoleic acid (cis-9, trans-11 CLA) were investigated in this study. Twelve Holstein cows in midlactation (150 +/- 19 DIM) were placed on alfalfa-based pasture and assigned to 4 treatments using a 4 x 4 Latin square design with 3-wk periods. Treatments were: 1) control grain supplement; 2) control grain supplement containing 170 g of LSO (LSO1); 3) control grain supplement containing 340 g of LSO (LSO2); and 4) control grain supplement containing 510 g of LSO (LSO3). Grain supplements were offered at 7 kg/d. Additional 100 g/d of algae, divided evenly between the 2 feeding times, were added to every treatment diet. Milk samples were collected during the last 3 d of each period and analyzed for chemical and fatty acid composition. Treatments had no effect on milk production (18.9, 18.5, 19.6, and 19.1 kg/d for treatments 1 to 4, respectively). Linseed oil supplementation caused a quadratic increase in milk fat (3.23, 3.44, 3.35, and 3.27% for treatments 1 to 4, respectively) and protein (3.03, 3.19, 3.12, and 3.08%) contents. Concentrations (g/100 g of fatty acids) of milk cis-9, trans-11 CLA (1.12, 1.18, 1.39, and 1.65 for treatments 1 to 4, respectively) and VA (3.39, 3.62, 4.25, and 4.89) linearly increased with LSO supplementations. Results from this trial suggest that the increase in milk cis-9, trans-11 CLA was proportional to the amounts of LSO fed. In conclusion, adding LSO to grazing dairy cow diets can improve the nutritional value of milk without compromising milk composition or cow performance.
Authors:
G Flowers; S A Ibrahim; A A AbuGhazaleh
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  91     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-01-25     Completed Date:  2008-02-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  722-30     Citation Subset:  IM    
Affiliation:
Department of Animal Science, Food and Nutrition, Southern Illinois University, Carbondale, IL 62901, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Body Weight / drug effects,  physiology
Cattle / metabolism*
Dietary Supplements
Eating / drug effects,  physiology
Female
Least-Squares Analysis
Linoleic Acids, Conjugated / metabolism*
Linseed Oil / administration & dosage*
Medicago
Medicago sativa
Milk / metabolism*
Milk Proteins / metabolism
Nutritive Value
Random Allocation
Chemical
Reg. No./Substance:
0/Linoleic Acids, Conjugated; 0/Milk Proteins; 8001-26-1/Linseed Oil

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


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