Resumen

ROSETE FERNANDEZ, Jorge Víctor et al. Frequency of serum antibodies against infectious bovine rhinotracheitis and bovine viral diarrhea viruses in bulls, and their relationship with the presence of the viruses in semen. Rev. mex. de cienc. pecuarias [online]. 2021, vol.12, n.4, pp.1151-1167.  Epub 06-Jun-2022. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v12i4.5739.

The objective was to estimate the frequency of serum antibodies against infectious bovine rhinotracheitis (IBRV) and bovine viral diarrhea (BVDV) viruses in unvaccinated bulls, as well as the relationship between the presence of antibodies in serum and the presence of these viruses in semen. Antibodies were detected by ELISA, while the presence of the viruses in semen by PCR. Logistic regression analyses were performed with the PROC GENMOD of SAS. The factors were: state, herd nested in state, and genotype of the bull (except for the presence of the viruses in semen). The degree of association between the presence of serum antibodies and the presence of the viruses in semen was measured by the phi (r) correlation. None of the three factors were significant (P>0.05). For IBRV, the frequency of serum antibodies by state ranged from 66 to 86 %, while by herd, it ranged from 28 to 90 %. For BVDV, the frequency of serum antibodies by state ranged from 58 to 76 %, while by herd, it ranged from 43 to 86 %. The presence of IBRV in semen, by state, ranged from 50 to 55 %, while by herd, it ranged from 33 to 80 %. No association (P>0.05) was found between the presence of antibodies in serum and the presence of IBRV (r=0.07) and BVDV in semen (r=0.16). The presence of serum antibodies suggests infection of bulls, but the presence of the viruses in semen suggests their transmission by sexual contact.

Palabras llave : Bulls; Infectious bovine rhinotracheitis; Bovine viral diarrhea; Antibodies; Antigens; Semen; Tropics.

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