Document Detail

Effect of dietary vitamin E on rumen biohydrogenation pathways and milk fat depression in dairy cows fed high-fat diets.
MedLine Citation:
PMID:  16428637     Owner:  NLM     Status:  MEDLINE    
Six lactating Holstein cows were assigned to a replicated Latin square design to test the effect of dietary vitamin E on milk fat depression and on the increased production of milk trans-10 C18:1 classically observed when feeding high doses of unsaturated fatty acids with low-fiber diets. Two diets (linseed diet and linseed diet + 12,000 IU of vitamin E/d) were compared during 2 periods of 21 d. The linseed diet presented a forage-to-concentrate ratio of 50:50 and contained extruded linseed (1.86 kg/d) and linseed oil (190 g/d). It was conceived to favor the "trans-11 to trans-10 shift" (low structural value and high level of unsaturated fatty acids). Milk yield and protein content were not affected by the diets. Milk of cows fed the linseed diet presented the typical symptoms of milk fat depression associated with a shift in biohydrogenation pathways: low fat content and high level of trans-10 C18:1. However, the high dose of dietary vitamin E provided significantly increased milk fat content (by 17.93%) and yield (by 15.56%) and decreased trans-10 C18:1 content (by 47.06%). In addition, it managed to significantly increase the daily yields of vaccenic (by 102.56%) and rumenic acids (by 56.67%). However, the sequence of administration of vitamin E influenced its effect, as vitamin E seemed to be more active in limiting the "trans-11 to trans-10 shift" when it was incorporated in the diet simultaneously with the fat. Once the shift had occurred, the subsequent addition of vitamin E was no longer able to completely counteract this process.
J Pottier; M Focant; C Debier; G De Buysser; C Goffe; E Mignolet; E Froidmont; Y Larondelle
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  89     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-01-23     Completed Date:  2006-05-05     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:  685-92     Citation Subset:  IM    
Unité de Biochimie de la Nutrition, Faculté d'Ingénierie Biologique, Agronomique et Environnementale, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium.
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MeSH Terms
Animal Nutritional Physiological Phenomena
Cattle / physiology*
Dietary Fats / administration & dosage*
Dietary Fats, Unsaturated / administration & dosage
Fats / analysis*
Fatty Acids / analysis
Hydrogenation / drug effects
Linoleic Acids, Conjugated / analysis
Linseed Oil / administration & dosage
Milk / chemistry*
Models, Statistical
Oleic Acids / analysis
Vitamin E / administration & dosage*
Reg. No./Substance:
0/Dietary Fats; 0/Dietary Fats, Unsaturated; 0/Fats; 0/Fatty Acids; 0/Linoleic Acids, Conjugated; 0/Oleic Acids; 1406-18-4/Vitamin E; 143-25-9/11-octadecenoic acid; 1839-11-8/9,11-linoleic acid; 8001-26-1/Linseed Oil

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

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