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Frequency and distribution of rob(1;29) in eight Portuguese cattle breeds
A Iannuzzi1, G P Di Meo, A Caputi Jambrenghi
1Physiopathology and Reproduction of Domestic Animals, Department of Animal Production and Food Inspection, Faculty of Veterinary Medicine, University Federico II, Naples, Italy.
Abstract:
Cytogenetic investigations performed in eight Portuguese cattle breeds revealed the presence of rob(1;29) in both heterozygous and homozygous conditions in all, and five breeds, respectively, with variable percentages of carriers as follows: 41.0% in Arouquesa, 69.9% in Barrosa, 39.4% in Maronesa, 2.8% in Mirandesa, 8.5% in Marinhoa, 1.8% in Mertolenga, 21.3% in Raca Brava and 21.5% in Alentejana. CBA- and RBA-banding were performed to ascertain the chromosomes involved in the chromosome abnormality. A total of 1,626 animals were investigated. Reproductive parameters (number of calves per 100 cows) were higher in Mirandesa (80%) when compared with both Maronesa (75%) and Barrosa (70%) breeds, underlining that rob(1;29) reduces fertility in the carriers.
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