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Relationships between milks differentiated on native milk fat globule characteristics and fat, protein and calcium compositions

Published online by Cambridge University Press:  03 August 2016

S. Couvreur  and
C. Hurtaud
S. Couvreur
Affiliation:
Unité de Recherche URSE, Université Bretagne Loire, Ecole Supérieure d’Agricultures (ESA), 55 rue Rabelais, BP 30748, 49007 Angers Cedex, France
C. Hurtaud*
Affiliation:
PEGASE, INRA, Agrocampus Ouest, 35590 Saint-Gilles, France
*
†E-mail: [email protected]
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Abstract

Many studies have shown that milk fat globule (MFG) diameter varies in dairy cows in relation to diet and/or breed. However, the mechanisms governing the size of the fat globules remain hypothetical. Our objective was to determine the variable biochemical characteristics (fat, protein, fatty acids (FA), casein and calcium (Ca) contents) between individual milk which differed in both MFG diameter and membrane content, in order to speculate about the links between milk synthesis and MFG secretion. With this aim, we built five databases of individual milk samples from 21 experiments performed between 2003 and 2011. Three of them grouped data from trials dealing with breed/diet effects and included information about: (i) MFG size/membrane, fat and protein contents (n=982), (ii) previous parameters plus FA profile (n=529) and (iii) previous parameters plus true protein composition and calcium contents (n=101). A hierarchical clustering analysis performed on these three databases yielded four groups differing in the MFG characteristics. We observed significant differences among groups for the following parameters: (i) fat content and fat : protein ratio; (ii) de novo and polyunsaturated FA contents; (iii) Ca contents. These relationships could result from potential process regulating the synthesis and secretion of MFG: (i) the apical membrane turnover for MFG secretion and (ii) cytoplasmic lipid droplet formation in the lactocyte during its migration from the basal to the apical pole. The two other databases grouped data from trials dealing with milking frequency (n=211), milking kinetics and milk type (residual v. cisternal) (n=224). They were used to study the relationships between the size of the MFG and milk composition for high native fat contents (from 60 up to 100 g/kg in residual milks). We observed curvilinear relationships between the size of the MFG and fat content, as well as with the fat : protein ratio. This result suggests that MFG diameter reaches a threshold but mechanisms are still unknown.

Keywords

milk fat globulemilk compositionmilk fat secretiondairy cowmilk fatty acid profile
Type
Research Article
Information
animal , Volume 11 , Issue 3 , March 2017 , pp. 507 - 518
Copyright
© The Animal Consortium 2016 

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