title: A cytogenetic survey of five breeds of cattle from Brazil.
abstract: One-hundred-and-thirty-nine animals from five breeds of cattle were studied cytogenetically. Three types of karyotype abnormalities were detected, two of them structural, t(1; 29) and ins(16), and one numerical (60,XY/61,XY + F). The first two, found in the Charolais race, presented familial recurrences; the last one, observed in the Norman breed, was sporadic. Pedigree studies showed that ins(16), an aberration not previously described in cattle, segregated in the ratio of 5 carriers to 10 normals. t(1; 29) occurred in mother and daughter. A variant of constitutive heterochromatin also presented familial recurrence in the Charolais breed.
mesh_terms: D000818:Animals; D001938:Brazil; D002417:Cattle / Q000235:genetics*; D002478:Cells, Cultured; D002869:Chromosome Aberrations; D002871:Chromosome Banding; D002875:Chromosomes / Q000648:ultrastructure*; D007178:Inbreeding; D007621:Karyotyping; D008214:Lymphocytes / Q000648:ultrastructure