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Free Content Conjugated Linoleic Acid (CLA) Content of Milk from Cows Fed Different Diets

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Abstract:

Conjugated linoleic acid (CLA) is a naturally occurring fatty acid in foods derived from ruminants. CLA is a term used for a mixture of positional and geometric isomers of linoleic acid that contain conjugated unsaturated double bonds. CLA has been shown to have many properties that are beneficial for human health. Two experiments were conducted at the same time on two groups of midlactating primiparous cows to determine the conjugated linoleic acid content of milk. Experimental diets were fed for 13 months – the first group of animals was offered a maize silage-based diet while the second group was fed a grass hay-based diet. Grass hay based diet supplied a significantly (P<0.01) larger CLA concentration in every controlled month. The CLA content in cows fed a grass hay-based diet varied between 153.85 mg/kg of milk reported in May 2004 and 419.01 mg/kg of milk reported in July 2004. The CLA content in group fed maize silage-based diet varied between 150.58 mg/kg of milk reported in May 2004 and 303.05 mg/kg of milk reported in July 2004. Increasing the CLA concentration in milk can increase the nutritive and therapeutic value of milk and dairy products.

Keywords: CONJUGATED LINOLEIC ACID; DAIRY COWS; GRASS HAY; MAIZE SILAGE; MILK

Document Type: Research Article

DOI: http://dx.doi.org/10.3409/173491605775789290

Publication date: October 1, 2005

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  • Folia biologica is an international quarterly journal that publishes papers on the broad field of experimental zoology, nuclear and chromosome research, and also ultrastructural studies. All papers are subject to peer reviews. Indexed in: ISI Master Journal List, Current Contents, Polish Scientific Journals Contents. I.F. 0.667
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