The studies involved the population of 2214 cows of the Black and White breed. From the studied population a group of 1710 head was separated. The animals of the group had Dutch Black and White ancestors and the group was called as West-Frisian cattle. The second group of 504 individuals were descendants of Black and White bulls bred in East-Frisian Islands and the group was called: East- Frisian cattle. The carried aut studies showed the polymorphism of amylase (AmI). The polymorphism occured in the three different phenotypes: AmI BB, AmI CC, AmI ВС, controlled by two codominant alleles: AmI BB, AmI CC, AmI ВС, controlled by two codominant alleles: AmIᴮ and AmIᶜ. Within the whale population 27,10% cows showed AmI BB phenotype 25,57% AmI CC and 47,33 - AmI phenotype. Within the West-Frisian population 24,68% of all individuals shoved AmI BB phenotype, 28,01% AmI CC phenotype and 47,31 - AmI phenotype. Within the East-Frisian cattle the distribution of tne phenotypes was as followed: AmI BB - 35,31%, AmI CC - 17,26% and AmI ВС - 47,43%. Comparing the two groups the statistically significant differences occured between AmI BB and AmI CC phenotypes. The obtained results did not showed significant difference in percent of homozygote and heterozygote frequency between the studied groups. The frequency of alleles in the all population amounted to: 0,51 for AmI , 0,49 AmIᶜ , within the West-Frisian group: 0,48 - Amᴮ , 0,52ᶜ AmI and within the East-Frisian group: 0,59 - AmI and 0,41 - AmIC.
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