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The genotypes for k-casein (k-CN), b-lactoglobulin (b-LG) and growth hormone (GH) were determined by polymerase chain reaction (PCR) and restriction enzyme digestion in seven breeds of cattle (Nelore, Gyr, Guzerá, Caracu, Charolais, Canchim and Santa Gertrudis). k-Casein had two alleles with the A allele occurring at a higher frequency in Bos indicus breeds (0.93, 0.92 and 0.91% for Gyr, Guzerá and Nelore, respectively). The b-lactoglobulin locus had two alleles in all of the breeds. European breeds had a higher frequency of the b-LG A allele than Zebu breeds. The GH locus had two alleles (L and V) in Bos taurus and was monomorphic (L allele only) in all of the Bos indicus breeds evaluated. The highest frequency for the V allele was observed in Charolais cattle. The markers used revealed a considerable similarity among breeds, with two main groups being discernible. One group consisted of Zebu and Santa Gertrudis breeds and the other consisted of European and Canchim breeds. Os genótipos de k-caseína (k-CN), b-lactoglobulina (b-LG) e hormônio de crescimento foram determinados por reação em cadeia de polimerase (PCR) e digestão com enzima de restrição em sete raças de bovinos (Nelore, Gir, Guzerá, Caracu, Charolesa, Canchim and Santa Gertrudis). A k-caseína apresentou dois alelos e as freqüências mais elevadas para o alelo A foram observadas em Bos indicus (0,93, 0,92 e 0,91% para as raças Gir, Guzerá e Nelore, respectivamente). A b-lactoglobulina apresentou dois alelos em todas as raças estudadas, sendo a freqüência do alelo A mais elevada nas raças européias. O loco de hormônio de crescimento apresentou dois alelos em Bos taurus e foi monomórfico (alelo L) em todas as raças zebuínas. A maior freqüência para o alelo V foi observado na raça Charolesa. Os marcadores investigados revelaram alta similaridade entre as raças, com a formação de dois grupos principais: um composto de raças zebuínas e a raça Santa Gertrudis e outro composto das raças européias e a raça Canchim

genetics and molecular biology

&lt;FONT FACE=Symbol&gt;k&lt;/FONT&gt;-Casein, &lt;FONT FACE=Symbol&gt;b&lt;/FONT&gt;-lactoglobulin and growth hormone allele frequencies and genetic distances in Nelore, Gyr, Guzerá, Caracu, Charolais, Canchim and Santa Gertrudis cattle