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The Journal of Heredity 1979:70(1):47-50
© 1979 The American Genetic Association 70:47-50

research-article

Nucleolus organizer regions in two species of Bovidae

DINO DI BERARDINO, FRANCES E. ARRIGHI, and NAT M. KIEFFER

Istituto Di Produzione Animale Dell'Universita' Di Napoli 80055 Portici, Italy
Department of Biology, The University of Texas System Cancer Center, M.D. Anderson Hospital and Tumor Institute Houston, TX 77030
Department of Animal Science, Texas A & M University College Station, Texas

Please address reprint requests to Dr. Arrighi.

Abstract

Silver-staining of nucleolar organizer regions (NORs) in somatic cells of Holstein cattle (Bos taurus) and European buffalo Murrah type (Bubalus bubalus) indicates that the NORs are located in the telomeres of chromosomes 2,3,4,11, and 29 of cattle and chromosomes 3,4,6,23, and 24 of buffalo. Chromosome identification was by Q-banding. Analysis of 326 metaphase cells showed a mean value of 7.7 ± 1.2 for Ag-NORs with a range between 4 and 10 for cattle. In all of the cells examined, either one or both homologues of chromosome 29 showed telomeric silver staining for cattle. Meiotic preparations showed not more than 5 clusters of silver grains in the pachytene stage of cattle.


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