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Response of milk fat concentration and yield to nutrient supply in dairy cows

Published online by Cambridge University Press:  22 February 2011

G. Maxin ,
H. Rulquin  and
F. Glasser
G. Maxin
Affiliation:
INRA, UMR 1080 Dairy Production, F-35590 St-Gilles, France Agrocampus Ouest, UMR 1080 Dairy Production, F-35000 Rennes, France
H. Rulquin
Affiliation:
INRA, UMR 1080 Dairy Production, F-35590 St-Gilles, France Agrocampus Ouest, UMR 1080 Dairy Production, F-35000 Rennes, France
F. Glasser*
Affiliation:
INRA, UR 1213 Herbivores, Site de Theix, F-63122 Saint-Genès-Champanelle, France
*
†E-mail: frederic.glasser@clermont.inra.fr
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Abstract

Dietary changes alter dairy cow milk fat concentration (MFC) and yield (MFY) through modifications in the supply of nutrients, which act as precursors or inhibitors of mammary fat synthesis. The current models used to formulate dairy cow diets cannot predict changes in milk fat. The knowledge of the effects of the nutrients on milk fat would help to progress toward this prediction. To this end, we quantified and compared the milk fat responses to variations in the supply of seven nutrients derived from digestion: volatile fatty acids, glucose, proteins, long-chain fatty acids (LCFA) and t10,c12-conjugated linoleic acid (CLA). A database was compiled from studies involving digestive infusions of these nutrients in dairy cows. It included 147 comparisons between a nutrient infusion and a control treatment. The nutrient infusions were limited to the range of physiological variations to mimic nutrient changes after dietary modifications. We established models for the response of MFC, MFY and milk fatty acid (FA) composition to the supply of each nutrient. MFC and MFY responses to the nutrients were significant and linear, except for the MFC response to glucose that was curvilinear. The nutrients differed in their effects on MFC and MFY: acetate, butyrate and LCFA increased MFC and MFY, whereas propionate, glucose and t10,c12-CLA decreased them. Protein infusions increased MFY and decreased MFC because of an increase in milk yield. The effects of numerous interfering factors related to animals, diets or experimental conditions were tested on the residuals of the response models. The responses of milk FA percentages are also provided. When adjusted to the in vivo variations in the nutrients observed after dietary changes, the effects of the different nutrients were moderate. Finally, this study showed that several of these nutrients could contribute to the changes in milk fat production and composition observed after dietary changes. This is a first step toward predicting milk fat response to changes in nutrient supply.

Keywords

milk fatdairy cowmeta-analysisnutrients
Type
Full Paper
Information
animal , Volume 5 , Issue 8 , August 2011 , pp. 1299 - 1310
Copyright
Copyright © The Animal Consortium 2011

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