Abstract
The study included 1083 Polish Holstein-Friesian strain Black-and-White cows. The genetic structure of the herd was determined on the basis of polymorphism within the aromatase gene (CYP19/Cfr 13I and CYP19/PvuII). Genotypes were identified by the PCR-RFLP method. The CYP19/Cfr 13I allele frequencies were as follows: A -0.86 and B -0.14. The CYP19/PvuII allele frequencies were as follows: A -0.91 and B -0.09. The highest average heterozygosity rate was found in herd A (0.2108). The largest genetic distance was between cows kept in farms A and C (0.00103).
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