Article (Scientific journals)
Genetic variability of milk fatty acids.
Arnould, Valérie; Soyeurt, Hélène
2009In Journal of Applied Genetics, 50 (1), p. 29-39
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Keywords :
delta-9 desaturase; diacylglycerol O-acyltransferase and genetic; milk fatty acids
Abstract :
[en] The milk fatty acid (FA) profile is far from the optimal fat composition in regards to human health. The natural sources of variation, such as feeding or genetics, could be used to increase the concentrations of unsaturated fatty acids. The impact of feeding is well described. However, genetic effects on the milk FA composition begin to be extensively studied. This paper summarizes the available information about the genetic variability of FAs. The greatest breed differences in FA composition are observed between Holstein and Jersey milk. Milk fat of the latter breed contains higher concentrations of saturated FAs, especially short-chain FAs. The variation of the delta-9 desaturase activity estimated from specific FA ratios could explain partly these breed differences. The choice of a specific breed seems to be a possibility to improve the nutritional quality of milk fat. Generally, the proportions of FAs in milk are more heritable than the proportions of these same FAs in fat. Heritability estimates range from 0.00 to 0.54. The presence of some single nucleotide polymorphisms could explain partly the observed individual genetic variability. The polymorphisms detected on SCD1 and DGAT1 genes influence the milk FA composition. The SCD1 V allele increases the unsaturation of C16 and C18. The DGAT1 A allele is related to the unsaturation of C18. So, a combination of the molecular and quantitative approaches should be used to develop tools helping farmers in the selection of their animals to improve the nutritional quality of the produced milk fat.
Disciplines :
Animal production & animal husbandry
Genetics & genetic processes
Food science
Author, co-author :
Arnould, Valérie ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Soyeurt, Hélène  ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Language :
English
Title :
Genetic variability of milk fatty acids.
Publication date :
2009
Journal title :
Journal of Applied Genetics
ISSN :
1234-1983
Publisher :
Polska Akademia Nauk, Poland
Volume :
50
Issue :
1
Pages :
29-39
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 09 July 2009

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