Frequency and distribution of rob (1;29) in three Portuguese cattle breeds.
Representative samples of Portuguese cattle from Barrosã, Maronesa, and Mirandesa breeds underwent cytogenetic investigation. Banding showed that 134 (65.0%) Barrosas, 74 (40.2%) Maronesas and 4 (1.6%) Mirandesas carried rob (1;29). The frequency of this translocation in the three breeds (39% in Barrosas, 23% in Maronesas, and 1% in Mirandesas) was in a genetic Hardy-Weinberg equilibrium for the three karyological forms (2n = 60, 2n = 59 and 2n = 58), strongly supporting the hypothesis for an ancient origin of this translocation and the hypothesis of the origin of Maronesas from Barrosã and Mirandesa cross-breeding.
Rangel-Figueiredo
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Departamento de Zootecnia, U.T.A.D., Vila Real, Portugal.
Iannuzzi
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D000818:Animals; D005075:Biological Evolution; D002417:Cattle / Q000145:classification / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D008297:Male; D011174:Portugal; D013045:Species Specificity; D014178:Translocation, Genetic