identification of QTL that affect the fatty acid composition of milk on sheep chromosome 11

In this work, we analysed 11 genetic markers localized on OAR11 in a commercial population of Spanish Churra sheep to detect QTL that underlie milk fatty acid (FA) composition traits. Following a daughter design, we analysed 799 ewes distributed in 15 half-sib families. Eight microsatellite markers...

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Bibliographic Details
Published in:Animal genetics 2010-06, Vol.41 (3), p.324-328
Main Authors: García-Fernández, M, Gutiérrez-Gil, B, García-Gámez, E, Sánchez, J.P, Arranz, J.J
Format: Article
Language:English
Subjects:
Animals
Chromosomes
Chromosomes, Mammalian
fatty acid composition
fatty acid profile
Fatty acids
Fatty Acids - analysis
Fatty Acids - biosynthesis
Genes
Milk
Milk - chemistry
OAR11
QTL
Quantitative Trait Loci
sheep
Sheep - genetics
Sheep - metabolism
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Summary:In this work, we analysed 11 genetic markers localized on OAR11 in a commercial population of Spanish Churra sheep to detect QTL that underlie milk fatty acid (FA) composition traits. Following a daughter design, we analysed 799 ewes distributed in 15 half-sib families. Eight microsatellite markers and three novel SNPs identified in two genes related to fatty acid metabolism, acetyl-CoA carboxylase α (ACACA) and fatty acid synthase (FASN), were genotyped in the whole population under study. The phenotypic traits considered in the study included 22 measurements related to the FA composition of the milk and three other milk production traits (milk protein percentage, milk fat percentage and milk yield). Across-family regression analysis revealed four significant QTL at the 5% chromosome-wise level influencing contents of capric acid (C10:0), lauric acid (C12:0), linoleic conjugated acid (CLA) and polyunsaturated fatty acids (PUFA) respectively. The peaks of the QTL affecting C10:0 and PUFA contents in milk map close to the FASN gene, which has been evaluated as a putative positional candidate for these QTL. The QTL influencing C12:0 content reaches its maximum significance at 58 cM, close to the gene coding for the glucose-dependent insulinotropic polypeptide. We were not able to find any candidate genes related to fat metabolism at the QTL influencing CLA content, which is located at the proximal end of the chromosome. Further research efforts will be needed to confirm and refine the QTL locations reported here.
ISSN:0268-9146
1365-2052
DOI:10.1111/j.1365-2052.2009.02000.x