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Variations of trans octadecenoic acid in milk fat induced by feeding different starch-based diets to cows

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Lipids

Abstract

The impact of starch sources differing in their velocities of ruminal degradation on the milk fat of dairy cows was studied. The animals received diets containing a slowly degradable (potatoes) or rapidly degradable (wheat) starch concentrate (40% of the dry matter) in a total mixed diet. Milk fat was the only animal performance factor affected: Cows produced significantly less milk fat when fed the wheat diet than the potato diet (−3.3 g/kg, −122 g/d; P<0.05). With the wheat diet, milk fat was poorer in short-chain FA and richer in unsaturated longchain FA, especially in trans octadecenoic acid (4.4 vs. 2.7% of the total FA, P<0.05). A very large increase in the isomer trans-10 18∶1 (+1.46% of the total FA) was observed. Because no difference in volatile FA concentrations in the rumen was revealed, the increase in trans octadecenoic acids, and particularly the isomer trans-10 18∶1, was associated with the larger postprandial drop in ruminal pH with wheat. Similar concentrate levels and FA profiles in both diets indicated that the decrease in milk fat was due to changes in the ruminal environment. Quicker degradation of wheat starch, and hence a greater drop in pH with this diet associated with the absence of any effect on volatile FA, strengthen the hypothesis developed in the literature of enzyme inhibition via increased levels of trans octadecenoic acids, especially the trans-10 isomer. Hence, milk fat can be decreased with rapidly degradable starch sources and not only with high levels of concentrates in the diet or added fat. More detailed work is necessary to elucidate the microorganisms involved and to determine whether metabolic pathways similar to those reported for high-concentrate diets are involved.

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Abbreviations

IPE:

isopropyl esters

IFA:

trans FA

VFA:

volatile FA

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Authors and Affiliations

  1. Laboratoire de Sciences Animales, Institut National de la Recherche Agronomique Ecole Nationale Supérieure d'Agronomique et des Industries Alimentaires (INRA-ENSAIA), Avenue de la Forêt de Haye, B.P. 172, 2, 54505, Vandoeuvre-lès-Nancy, France

    S. Jurjanz, V. Monteils & F. Laurent

  2. Unité de Nutrition Lipidique, INRA de Dijons, France

    P. Juaneda

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  1. S. Jurjanz
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  2. V. Monteils
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  3. P. Juaneda
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  4. F. Laurent
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Correspondence to S. Jurjanz.

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Jurjanz, S., Monteils, V., Juaneda, P. et al. Variations of trans octadecenoic acid in milk fat induced by feeding different starch-based diets to cows. Lipids 39, 19–24 (2004). https://doi.org/10.1007/s11745-004-1196-4

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  • DOI: https://doi.org/10.1007/s11745-004-1196-4

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