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Effects of supplemental dietary fatty acids on milk yield and fatty acid composition in high and medium yielding cows

Published online by Cambridge University Press:  12 May 2008

Martin Riis Weisbjerg ,
Lars Wiking ,
Niels Bastian Kristensen  and
Peter Lund
Martin Riis Weisbjerg*
Affiliation:
Faculty of Agricultural Sciences, University of Aarhus, Research Centre Foulum, P.O. Box 50, DK-8830Tjele, Denmark
Lars Wiking
Affiliation:
Faculty of Agricultural Sciences, University of Aarhus, Research Centre Foulum, P.O. Box 50, DK-8830Tjele, Denmark
Niels Bastian Kristensen
Affiliation:
Faculty of Agricultural Sciences, University of Aarhus, Research Centre Foulum, P.O. Box 50, DK-8830Tjele, Denmark
Peter Lund
Affiliation:
Faculty of Agricultural Sciences, University of Aarhus, Research Centre Foulum, P.O. Box 50, DK-8830Tjele, Denmark
*
*For correspondence; e-mail: [email protected]
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Abstract

The present study tested the hypothesis that supplemental dietary fatty acids (FA) affect the energy corrected milk yield in proportion to the milk production level of dairy cows, and increase both long chain FA proportion of milk FA and milk fat globule diameter. Sixteen Danish Holstein cows were divided into four 4×4 Latin squares with two squares of medium yielding cows (32·2 kg energy corrected milk (ECM)/d; 158 days in milk (DIM)) and two squares of high yielding cows (40·0 kg ECM/d; 74 DIM). Experimental length was 12 weeks, with three weeks for each of the four periods. The four treatments were no supplementation (17 g FA/kg dry matter (DM)) and three diets with supplemented FA (29, 40, and 52 g total FA/kg DM, respectively) obtained by substituting barley with Palm Fatty Acid Distillate (PFAD) fat. Diets were offered as total mixed rations with 63% grass/clover silage (DM basis). Dry matter intake decreased with increasing FA supplementation, but net energy intake was not affected. The general linear responses to 10 g/kg DM increase in FA level were 1·1 kg ECM (P<0·0001), 0·061 kg milk fat (P<0·0001), 0·012 kg milk protein (P=0·09) and 0·052 kg lactose (P=0·0002) per day, and linear responses in milk composition were 0·39 g fat (P=0·07), −0·71 g protein (P<0·0001) and 0·05 g lactose (P=0·3) per kg milk, and 0·092 μm (P<0·0001) in milk fat average globule diameter. Fatty acid supplementation decreased short- and medium-chain FA and C16:0 and increased C18:1 proportions of total FA in milk. Supplemental dietary FA increased ECM yield but not in proportion to production level as anticipated, and increased average FA chain length and milk fat globule diameter.

Keywords

Milk fat globule diameterfatfatty aciddairy cowsMilk composition
Type
Research Article
Information
Journal of Dairy Research , Volume 75 , Issue 2 , May 2008 , pp. 142 - 152
Copyright
Copyright © Proprietors of Journal of Dairy Research 2008

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