Abstract

MARTINEZ, D. et al. Transmisión transplacentaria de Neospora caninum en bovinos de cría de la Provincia de Corrientes, Argentina. Rev. vet. [online]. 2012, vol.23, n.1, pp.43-45. ISSN 1669-6840.

Neosporosis is one of the most important diseases that causes reproductive loses in cattle. It is caused by Neospora caninum, Apicomplexa protozoarian that infects cattle due to consumption of contaminated foods with excrements of canidae, its definitive host, and by transplacentary way. In this work it was evaluated the frequency of transplacentary and after-born transmission of N. caninum in 56 positive Brahman and Brangus cows and their calves at birth and prospectively until one-year-old, through the indirect enzymeimmunoassay (ELISAi). Results were expressed as percentages of positivity (PP), and indirect immune-fluorescence serological tests. The proportion of positive cows and calves were 14.3% (8/56) y 17.9% (10/56), respectively. Forty six cows and their calves were classified as neosporosis-negative (4.2 ± 3.8 PP, ELISAi). From 10 positive calves 8 were born from positive dams and from these only 5 were positive to serological tests before colostrums consumption (51.6 ± 17.3 PP, ELISAi). The 3 remaining calves reached a similar value (59.0 ± 38.1 PP, ELISAi). In 62% of the calves the antibody levels kept on ≥ 25 PP until 6 months-old. Two calves that were born serologically negative became positive at 9 months-old

Keywords : beef cattle; neosporosis; serologic diagnosis; Argentina.

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