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Abstract

Necropsies were performed on 354 fetuses from dairy and beef herds submitted from 1994 to 2000 to the diagnostic laboratories at Instituto Nacional de Tecnología Agropecuaria, Balcarce, Argentina. Samples from the fetuses were examined for pathogenic organisms and processed for microscopic examination. An aetiological diagnosis was made for 161 (45.5%) of the fetuses. No diagnosis was made for 193 (54.5%) fetuses. Infectious agents were isolated from 122 (34.4%) of the fetuses, bacterial agents being involved in 80 (22.6%) of these. The most common bacterial agents isolated from the fetuses were Brucella abortus in 28 fetuses, Campylobacter fetus in 26 cases, and Escherichia coli in 9 cases. Bovine herpesvirus and bovine viral diarrhoea virus were found in 9 and 6 cases, respectively. Neospora caninum was detected by an immunohistochemical technique in 26 cases (7.3%). Congenital abnormalities, dystocia and mummifications were found in 8, 19 and 11 cases, respectively.

Current trends in bovine abortion in Argentina

“…Surprisingly, this agent was identified in one fetus of seven month from a beef herd. Campero et al (2003) associate the poor diagnosis of trichomonosis from fetuses from beef herds of Argentina, to the difficulty of recover the specimens during the first trimester of gestation in those extensive production systems. The identification of trichomonads from abomasal fetal content by dark field microscopy and culture, and the lymphohistiocytic bronchopneumonia with occasional presence of multinucleated giant cells confirmed the diagnosis of abortion.…”

Prevalence study of Bovine viral diarrhea virus by evaluation of antigen capture ELISA and RT-PCR assay in Bovine, Ovine, Caprine, Buffalo and Camel aborted fetuses in Iran

“…The prevalence of BVDV in Bovine of Iran (20.48%) is higher than Argentina (1.69%) (Campero et al 2003), Greek (14%) (Billinis et al 2005) And India (17.31%%) (Sudharshana et al 1999) But is lower than Northern Portugal (35%) (Niza-Ribeiro et al 2005) and Turkey (23.07%) (Seyyal et al 2002). …”

Controlling Endemic Neospora caninum-Related Abortions in a Dairy Herd From Argentina

“…During 2009, 13.1% out of 746 heifers aborted; differential serological diagnosis was performed in dams that aborted, using BVDV and BoHV-1 seroneutralization, Leptospira spp. microscopic agglutination test (MAT), and N. caninum indirect fluorescent antibody test (IFAT) (11). Additionally, all heifers and cows were bled the same year in order to calculate the association of abortion and Neospora serostatus (17).…”

“…Also, some reproductive management practices have been proposed to control transmission. Embryo transfer is an effective way to prevent vertical transmission from seropositive dams (10,11). Interestingly, artificial insemination (AI) using semen from beef bulls (specifically Limousin and Belgian Blue) reduced the rate of N. caninum related abortions of seropositive dairy dams (12,13).…”