Seroprevalence and detection of bovine leukosis virus in semen from breeding bulls in Costa Rica
Bovine leukemia virus (BLV) causes enzootic bovine leukosis, a persistent infection and the most important neoplastic disease in cattle. It is spread primarily by transferring infected lymphocytes through blood from carriers to healthy animals. The present study is aimed at determining the seropos...
Autores Principales: | Chacón Calderón, Jorge, Leiva, Roberto, ROMERO-ZUÑIGA, JUAN JOSÉ, Navarro, Leonel, Dolz, Gaby |
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Formato: | Artículo |
Idioma: | Inglés |
Publicado: |
Springer Nature
2023
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Materias: | |
Acceso en línea: |
http://hdl.handle.net/11056/26987 https://doi.org/10.1007/s11250-023-03763-5 |
Sumario: |
Bovine leukemia virus (BLV) causes enzootic bovine leukosis, a persistent infection and the most important neoplastic disease
in cattle. It is spread primarily by transferring infected lymphocytes through blood from carriers to healthy animals. The
present study is aimed at determining the seropositivity of BLV in breeding bulls from Costa Rica and at detecting for the
frst time in the country BLV DNA in bull semen. Between May 2011 and August 2018, 379 blood and 133 semen samples
were collected from bulls distributed in 118 farms. The serum was analyzed by an enzymatic immunoassay and the semen
by polymerase chain reaction and sequencing. BLV seropositivity was 43.5% (165/379), while 64.4% (76/118) of the farms
had positive reactors. Holstein (75.7%) and Jersey (73.0%) breeds showed the highest seropositivity. In addition, Bos taurus
bulls (68.1%), older than seven years (50.0%), and those belonging to dairy farms (75.5%) had higher seropositivity compared
to Bos indicus (17.7%), younger than seven years (42.2%), and those from beef farms (15.5%), respectively. Moreover, Bos
taurus bulls had a higher risk of being seropositive than Bos indicus (OR=3.4; 95% CI: 1.7–6.8). BLV DNA was found in
one semen sample (2.5%; 1/40) from a seropositive bull. The importance of serum and molecular BLV screening in semen
samples and the potential role of some risk factors associated with the disease, such as the bull’s age, genotype, and type of
livestock productive system, is argued in the present report. |
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