Journal
CZECH JOURNAL OF ANIMAL SCIENCE
Volume 55, Issue 12, Pages 521-537Publisher
CZECH ACADEMY AGRICULTURAL SCIENCES
DOI: 10.17221/2485-CJAS
Keywords
review; bovine milk fat; milk fat profile alteration; fatty acids; CLA; rumenic acid; vaccenic acid; pasture; fresh forage; silage; hay
Categories
Funding
- Ministry of Education, Youth and Sports of the Czech Republic [MSM 6007665806]
- Ministry of Agriculture of the Czech Republic [QH 81210]
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The nutritional image of bovine milk fat has suffered for years because of the association of saturated fatty acids and coronary heart disease. Thus the alteration of fatty acid composition has been a long-term strategy. Forages, even though containing a relatively low level of lipids, are the cheapest and often the major source of beneficial unsaturated fatty acids in ruminant diets. Recent progress in the research of factors affecting fatty acid content and composition in fresh and preserved forages and the associations between feeding such forages and milk fat profile are reviewed. Milk from cows grazed or fed fresh forage, especially from species-rich grasslands or forage legumes, has a considerably higher ratio of unsaturated to saturated fatty acids and a higher content of nutritionally beneficial trans-fatty acids (e.g. CLA, vaccenic acid) than milk from cows fed silage or hay. Grass and legume silages seem to affect the fatty acid profile more propitiously than maize silage.
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