Eject of conjugated linoleic acid (CLA) and sunflower seed on the composition of cow milk | Wirkung konjugierter Linolsäuren (CLA) und Sonnenblumensaat auf die Milchzusammensetzung bei Kühen
2008
Hoffmann, A., Hohenheim Univ., Stuttgart (Deutschland). Institut für Tierernährung | Steingass, H. | Drochner, W.
The aim of the present study was to determine the effect of sunflower seed and a CLA supplement (Lutrell pure) on the composition of milk from dairy cows. In comparison to a control diet, supplemented with sunflower seed extraction meal, a diet with 5% of crushed sunflower seed (in DM, corresponding to 500g sunflower fat) and a diet with 0,25% of a CLA supplementation were given. The diet with the crushed sunflower seed decreased the content of de novo synthesized fatty acids (FA) ( C15), the content of FA which passes over from the fodder ( C18) into the milk fat rises clearly. The milk fat of the sunflower seed diet was more unsaturated and the content of mono and polyunsaturated FA was even higher in comparison to the control. The CLA supplement decreased also the content of de novo synthesized FA, the FA passing over from the fodder is hardly affected in comparison to the control. These results show that the CLA isomer C18:2 trans10 cis12, which was the main isomer in the CLA supplement, is a potent inhibitor of the milk fat de novo synthesis. A comparison of the two diets show, that the CLA supplement affect more the de novo synthesis than the passing over of FA of the fodder. The SB diet importantly affects the de novo synthesis and the passing over of FA of the fodder. Both diets cause a significant higher milk yield per day.
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