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Fréquences alléliques des caséines chez les chèvres des Pyrénées. Cas particulier de la caséine β nulle

Abstract : After 4 years of preliminary observations (1992-1995), the genetic polymorphisms of caseins of "Pyrenees" goats was analyzed in 1996, using blood and milk samples from 862 females and 63 males spread in 45 herds. Three of the 4 main caseins were studied: alpha SI, alpha S2 and beta. For the alpha S1 casein, the intermediate allele E is predominant, more frequent than the "strong" alleles (A, B3 and B4), the "weak" allele F and 2 null alleles. Within the null alleles, the 02 allele is rather frequent in the sampled males and females and its geographic origin may be located. The beta casein has 2 alleles: the null allele was found in 82 % of herds at a 0.11 frequency. About 40 % of females have a mutant defective allele, either at the aS1 locus or at the beta locus, with important consequences on milk quality for cheese production. For the null allele of the beta casein, the population is at the equilibrium but different frequencies exist among groups. In perspective, the selection decision on mutant defective alleles depends on the orientation of the breeders : kid production for meat in the herds under genetic conservation policies or improvement of milk quality for cheese production in the traditional dairy herds.
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G. Ricordeau, M.F. Mahé, Marie-Annick Persuy, Christine Leroux, V. François, et al.. Fréquences alléliques des caséines chez les chèvres des Pyrénées. Cas particulier de la caséine β nulle. Productions animales, Institut National de la Recherche Agronomique, 1999, 12 (1), pp.29-38. ⟨hal-02698577⟩

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