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Stearoyl-Coenzyme a desaturase gene polymorphism and milk fatty acid composition in Italian Holsteins

Mele, Marcello and Conte, Giuseppe and Castiglioni, Bianca and Chessa, Stefania and Macciotta, Nicolò Pietro Paolo and Serra, Andrea and Buccioni, Arianna and Pagnacco, Giulio and Secchiari, Pierlorenzo (2007) Stearoyl-Coenzyme a desaturase gene polymorphism and milk fatty acid composition in Italian Holsteins. Journal of Dairy Science, Vol. 90 (9), p. 4458-4465. eISSN 1525-3198. Article.

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DOI: 10.3168/jds.2006-617


Milk fatty acid composition is a parameter of great interest for evaluation of nutritional quality of milk. Stearoyl-CoA desaturase (SCD) is a key enzyme in mammary lipid metabolism because it is able to add a double bond in the cis 9-position in a large spectrum of medium- and long-chain fatty acids. A polymorphism with 2 alleles (A and V) in the fifth exon of the SCD gene has been reported. The effect of SCD genotype on individual milk fatty acid composition and on cis-9 unsaturated/saturated fatty acid ratios of 297 Holstein Italian Friesian cows was investigated in this paper. The SCD genotypes were determined by using a single strand conformation polymorphism method. Relative frequencies of SCD genotypes were 27, 60, and 13% for AA, AV, and VV, respectively. Milk of AA cows had a greater content of cis-9 C18:1 and total monounsaturated fatty acids and a higher C14:1/C14 ratio than did milk of VV cows. The relative contribution of SCD genotype to variation of monounsaturated fatty acids, cis-9 C18:1, and cis-9 C14:1 was 5, 4, and 7.7%, respectively. No significant differences were detected between SCD genotypes in the milk content of cis-9, trans-11 C18:2. Results of the present work provide some indication of an association between SCD locus and the fatty acid profile in the examined sample of Italian Holsteins, thus suggesting a possible role of this gene in the genetic variation of milk nutritional properties.

Item Type:Article
ID Code:1046
Uncontrolled Keywords:Stearoyl-CoA desaturase polymorphism, conjugated linoleic acid, monounsaturated fatty acid
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/17 Zootecnica generale e miglioramento genetico
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze zootecniche
Publisher:American Dairy Science Association
Deposited On:18 Aug 2009 10:04

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