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). 284-291. ISSN 0931-2439
|
(Document in English)
PDF (author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 88kB |
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 (FRANCE) French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE) |
Laboratory name: | |
Statistics: | download |
Deposited On: | 23 Nov 2010 14:11 |
Repository Staff Only: item control page