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Carbonic anhydrase polymorphisms in nellore, canchim and in dairy crossbred cattle in Brazil

Lúcia Panepucci

EMBRAPA - UEPAE de São Carlos, Caixa Postal 339, 13560 São Carlos SP, Brasil

ABSTRACT

Carbonic anhydrase (CA) polymorphism was studied in 779 animals from three different breeding populations (Canchim, Nellore and European-Zebu crossbred dairy cattle). Six different phenotypes were detected, probably the result of three alleles: CAS, CAF and CAZ. The frequencies of the alleles for CAS, CAF and CAZ were 0.931, 0.055 and 0.014 in Canchim (5/8 Charolais + 3/8 Zebu), 0.750, 0.008 and 0.242 in Nellore and 0.852, 0.103 and 0.045 for the dairy group, respectively. The CA isozymes showed different thermostability when tested at 57 and 59°C. Phenotype CAZ had higher susceptibility than CAS. This suggests a functional difference that could be related to environmental factors.

Keywords: carbonic; anhydrase; polymorphisms; nellore.

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