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Effects of fat source and dietary sodium bicarbonate plus straw on the conjugated linoleic acid content of milk of dairy cows

Troegeler-Meynadier, Annabelle and Nicot, Marie-Claude and Enjalbert, Francis Effects of fat source and dietary sodium bicarbonate plus straw on the conjugated linoleic acid content of milk of dairy cows. (2007) Archives of Animal Nutrition, vol. 61 (n° 5). pp. 406-415. ISSN 1745-039X

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Official URL: http://dx.doi.org/10.1080/17450390701563474

Abstract

The effects of fat source (0.7 kg of fatty acids from extruded soybeans or palmitic acid), of sodium bicarbonate (0.3 kg) plus straw (1 kg) and the interaction of these treatments on the content of conjugated linoleic acid (CLA) in the milk of dairy cows were examined. During nine weeks a group of 10 cows received a ration with palmitic acid and bicarbonate plus straw (ration PAB). During three periods of three weeks a second group of 10 cows received successively a ration with extruded soybeans and bicarbonate plus straw (ration ESB), a ration with palmitic acid without bicarbonate or straw (ration PA), and a ration with extruded soybeans without bicarbonate or straw (ration ES). Rations ES and ESB increased the content of polyunsaturated fatty acids in milk, but decreased milk fat content, compared to rations PAB and PA. Ration ESB led to the greatest milk CLA content, by a synergy between the high amount of dietary fat, and the action of bicarbonate plus straw, favouring trans11 isomers of CLA and C18:1, presumably via a ruminal pH near neutrality. Ration ES favoured trans10 isomers, not desaturated in the mammary gland, so that the milk CLA content was lower than with ration ESB, and resulted in the lowest milk fat content. In conclusion, a ration supplemented with both extruded soybeans and bicarbonate plus straw, was an efficient way to increase the CLA content in the milk of dairy cows.

Item Type:Article
Additional Information:Thanks to Taylor & Francis editor. This is an electronic version of an article published in Archives of Animal Nutrition (2007, vol. 61, n°5, p 406-415) ARCHIVES OF ANIMAL NUTRITION is available online at : http://www.informaworld.com/smpp/content~db=all?content=10.1080/17450390701563474
Audience (journal):International peer-reviewed journal
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Institution: Université de Toulouse > Ecole Nationale Vétérinaire de Toulouse - ENVT
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Deposited By: Annabelle Troegeler
Deposited On:23 Nov 2010 14:44

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