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Effects of induced subacute ruminal acidosis on milk fat content and milk fatty acid profile

Enjalbert, Francis and Videau, Yannick and Nicot, Marie-Claude and Troegeler-Meynadier, Annabelle Effects of induced subacute ruminal acidosis on milk fat content and milk fatty acid profile. (2008) Journal Of Animal Physiology And Nutrition, 92 (3). pp. 284-291. ISSN 0931-2439

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0396.2007.00765.x/full

Abstract

Two lactating dairy cows fitted with a rumen cannula received successively diets containing 0%, 20%, 34% and again 0% of wheat on a dry matter basis. After 5, 10 and 11 days, ruminal pH was measured between 8:00 and 16:00 hours, and milk was analysed for fat content and fatty acid profile. Diets with 20% and 34% wheat induced a marginal and a severe subacute ruminal acidosis respectively. After 11 days, diets with wheat strongly reduced the milk yield and milk fat content, increased the proportions of C8:0 to C13:0 even- or odd-chain fatty acids, C18:2 n-6 and C18:3 n-3 fatty acids but decreased the proportions of C18:0 and cis-9 C18:1 fatty acids. Wheat also increased the proportions of trans-5 to trans-10 C18:1, the latter exhibiting a 10-fold increase with 34% of wheat compared with value during the initial 0% wheat period. There was also an increase of trans-10, cis-12 C18:2 fatty acid and a decrease of trans-11 to trans-16 C18:1 fatty acids. The evolution during adaptation or after return to a 0% wheat diet was rapid for pH but much slower for the fatty acid profile. The mean ruminal pH was closely related to milk fat content, the proportion of odd-chain fatty acids (linear relationship) and the ratio of trans-10 C18:1/trans-11 C18:1 (nonlinear relationship). Such changes in fatty acid profile suggested a possible use for non-invasive diagnosis of subacute ruminal acidosis.

Item Type:Article
Additional Information:Journal website : http://onlinelibrary.wiley.com/journal/10.1111/%28ISSN%291439-0396
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Ecole Nationale Vétérinaire de Toulouse - ENVT
French research institutions > Institut National de la Recherche Agronomique - INRA
Laboratory name:
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Deposited By: Annabelle Troegeler

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