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International Journal of Dairy Science
  Year: 2007 | Volume: 2 | Issue: 4 | Page No.: 356-363
DOI: 10.3923/ijds.2007.356.363
DNA Polymorphisms of Casein Genes in Local Goat’s Population in the Southern Tunisia
Ouni Mabrouk , Gaddour Amor , Abdennebi Mouldi and Najari Sghaier

Abstract:
The type and frequency of local goat milk casein αS1 and αS2 alleles was studied using about 150 individual milk and goat blood samples. The study starts the establishment of the local goat population genetic molecular characterization through the casein gene polymorphism. Genotypic and allelic individual DNA composition was realized by molecular analysis procedures. Results highlighted the local population large variability either for casein allele and variants. The most represented casein phenotype in the population was AB with about 38% as frequency; the BB and AA phenotypes have, respectively 36 and 17%. The genetic determinism of the local goat illustrates some specificity towards Mediterranean caprine breeds. Also, a large polymorphism seems to exist among local goat pigment types showing an intra population genetic diversity. For the allele A, the most variant identified was Ab. The high presence of the allele O within the local population (12%) distinguishes the indigenous population among caprine breeds. The traditional consanguine mating in the pastoral mode explains the O presence. The DNA polymorphisms of the caseins showed a high genetic variability and the possibility to select high productive local goats. Genetic improvement plans should account with the population specificities, especially at the level of the milk quality.
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How to cite this article:

Ouni Mabrouk , Gaddour Amor , Abdennebi Mouldi and Najari Sghaier , 2007. DNA Polymorphisms of Casein Genes in Local Goat’s Population in the Southern Tunisia. International Journal of Dairy Science, 2: 356-363.

DOI: 10.3923/ijds.2007.356.363

URL: https://scialert.net/abstract/?doi=ijds.2007.356.363

 
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