Fresh Forage and Solin Supplementation on Conjugated Linoleic Acid Levels in Plasma and Milk
| Autor: | A.T. Ward, K.M. Wittenberg, L. Malcolmson, H.M. Froebe, R. Przybylski |
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| Rok vydání: | 2003 |
| Předmět: |
Rumen
030309 nutrition & dietetics Linolenic acid Linoleic acid Conjugated linoleic acid Vaccenic acid Oleic Acids Forage Lipoproteins VLDL Biology Fats Linoleic Acid 03 medical and health sciences chemistry.chemical_compound Fodder Flax Genetics Animals Food science Dairy cattle 2. Zero hunger 0303 health sciences Fatty Acids 0402 animal and dairy science alpha-Linolenic Acid food and beverages 04 agricultural and veterinary sciences 040201 dairy & animal science Diet Milk chemistry Hay Cattle Female lipids (amino acids peptides and proteins) Animal Science and Zoology Food Science |
| Zdroj: | Journal of Dairy Science. 86:1742-1750 |
| ISSN: | 0022-0302 |
| DOI: | 10.3168/jds.s0022-0302(03)73760-6 |
| Popis: | Two experiments were run concurrently to determine the effect of fresh forage consumption on the production and proportions of plasma and milk fat vaccenic acid (VA), conjugated linoleic acid (CLA), and linolenic acid in diary cattle. In experiment 1, the cows consumed 50, 65, and 80% of their feed intake as pasture with the remainder of intake as a barley-based concentrate. The proportion of VA in milk fatty acids increased 12% when pasture intake increased from 50 to 65% of total dry matter intake and VA, CLA, and linolenic acid proportions increased 26, 18, and 27%, respectively, as pasture increased from 65 to 80% of dietary intake. In experiment 2, fresh forage was compared to conserved hay (cut from the same pasture the previous summer) to determine the effect on plasma and milk fat VA, CLA, and linolenic acid. Also, the effect of crushed solin seed (a flax cultivar that is high in linoleic acid) supplementation to the fresh forage diet was determined. Fresh forage compared to conserved hay in the diet, increased the proportion of CLA in the plasma very low density lipoproteins (VLDL) fraction by 71% but had no effect on linolenic acid. Supplementation of the fresh forage diet with a linoleic acid source increased VA and CLA in the plasma VLDL fraction 25 and 58% and slightly decreased the proportion of linolenic acid. Fresh forage, compared to conserved hay, increased milk fat VA and CLA proportions by 22 and 15%. Supplementing the fresh forage diet with linoleic acid from crushed solin seed further increased milk fat VA and CLA proportions 41 and 25%. Solin supplementation in a lactation diet is a superior method to increase CLA levels in milk fat than feeding fresh forage alone. |
| Databáze: | OpenAIRE |
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