Publicação: Bull semen varibles after experimental exposure with Bovine Herpesvirus type 5
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2011-03-01
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Elsevier B.V.
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The influence of Bovine Herpesvirus type 5 (BoHV-5) infection on semen variables and sperm morphology collected from healthy bulls with no reproductive disorder was evaluated in ten ejaculates distributed into two experimental groups: group 1, bull semen exposed to 10(2.3) (tissue culture infectious dose) TCID(50)/50 mu l of a Brazilian strain of BoHV-5 (US9/BR/2007; GU9457818) and group II, unexposed bull control semen. After experimental infection, the semen was frozen-thawed prior to computerized analysis (CASA) of sperm motility and movement. Also analyzed were sperm phosphatidylserine transposition, acrosomal integrity, mitochondrial function, plasma membrane integrity and Annexin V expression. Viable BoHV-5 particles and their DNA were detected in infected semen after virus isolation and in situ hybridization (ISH) assay. The ISH revealed the BoHV-5 US9 gene in the acrosome and tail of infected spermatozoa. The only remarkable differences between groups land II were the sperm kinetic variables, whereby infected sperm had a lesser mean velocity (VAP) and curvilinear velocity (VCL) values as compared to controls (P <= 0.05). However, the straightness coefficient (STR) and beat cross frequency (BCF) values were higher in infected sperm. These results indicate that BoHV-5 can be found in infected sperm but induces no functional and morphological damage even after freeze-thawing, and, importantly, BoHV-5 can be spread via in vitro and in vivo reproductive biotechnology procedures. (C) 2011 Elsevier B.V. All rights reserved.
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Animal Reproduction Science. Amsterdam: Elsevier B.V., v. 124, n. 1-2, p. 55-60, 2011.
