Bovine leukosis virus (BLV) is cattle retrovirus infection. It causes malignant lymphoma  from 1 to 5 % of infected cattle. BLV is widespread in many countries of the world. It is registered in all Russian regions. BLV infection reaches 70 % and higher in many cattle herds. In 1980 40 percent of dairy herds and 11 percent of beef herds were BLV infected in Canada (Samagh and Kellar, 1980). In US 89 % of all dairy operations and 43.5 % of all dairy cattle were BLV seropositive (Leukassay et al., 1999). In 75 % of seropositive herds 25 % of individual dairy cows were seropositive for BLV. In dairy cattle seroprevalennce (a measurement of BLV magnitude) was higher, than it was in  beef cattle. In operations with low BLV infection culling may be the most effective method. It is necessary to study the resistance of hereditary determination to BLV infection and ways to decrease animals’ infection with the help of selection methods. 

V. L Petukhov, N. N Kochnev, A. D Karyagin, O. S Korotkevich, I. V Petukhov, V. G Marenkov, A. G Nezavitin, G. N Korotkova

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 13, , 13.33, 2002
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