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Effect of -Casein Polymorphism on Milk Composition in the Orobica Goat

F. Chiatti^*, S. Chessa^*, P. Bolla^*, G. Cigalino^*, A. Caroli and G. Pagnacco^*

^* Dipartimento di Scienze e Tecnologie Veterinarie per la Sicurezza Alimentare, Università degli Studi di Milano, 20134 Milano, Italy
Dipartimento di Scienze Biomediche e Biotecnologie, Università degli Studi di Brescia, Brescia, Italy

¹ Corresponding author: caroli{at}med.unibs.it

The aim of this work was to study the effects of isoelectrofocusing (IEF) milk protein variants on milk composition in the Italian Orobica goat breed, which is characterized by a rather high frequency of the -casein (CSN3) B^IEF allele. Significant associations were found between the IEF phenotype and protein and casein percentages. A favorable effect of the CSN3 B^IEF variant was found for both protein and casein percentages, with a codominance trend for the 3 phenotypes: BB > AB > AA. Depending on the selection purpose, emphasis could be given to different -casein variants in breeding. The high frequency of B^IEF could be exploited in breeding strategies to improve the protein and casein percentages when cheese making is a selection objective.

Key Words: goat • -casein • genetic polymorphism • milk composition

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