Causes of fetal death in the Flemish cattle herd in Brazil
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Published:2023-04
Issue:
Volume:
Page:766-772
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ISSN:2231-0916
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Container-title:Veterinary World
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language:en
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Short-container-title:Vet World
Author:
Marian Lucas1ORCID, Withoeft Jéssica Aline1, Costa Leonardo da Silva1ORCID, Ribeiro Luiza Ramos1ORCID, Melo Isadora Cristina1ORCID, Alves Raquel Silva2ORCID, Baumbach Letícia Ferreira2ORCID, Pinto Maicon Gaissler Lorena3ORCID, Snak Alessandra4ORCID, Miletti Luiz Claudio5ORCID, Ferraz Sandra Maria6ORCID, Sfaciotte Ricardo Antônio Pilegi6ORCID, Canal Cláudio Wageck2ORCID, Casagrande Renata Assis1ORCID
Affiliation:
1. Laboratory of Animal Pathology, Universidade do Estado de Santa Catarina (UDESC), Lages, Santa Catarina, Brazil. 2. Laboratory of Veterinary Virology, Universidade Federal do Rio Grande do Sul (UFRGS) Porto Alegre, Rio Grande do Sul, Brazil. 3. Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (EPAGRI-SC), Lages, Santa Catarina, Brazil. 4. Laboratory of Parasitology and Parasitic Diseases, UDESC, Lages, Santa Catarina, Brazil. 5. Laboratory of Biochemistry of Hemoparasites and Vectors, UDESC, Lages, Santa Catarina, Brazil. 6. Center for Animal Microbiological Diagnosis, UDESC, Lages, Santa Catarina, Brazil.
Abstract
Background and Aim: Flemish cattle in Brazil are on the brink of extinction and are found only in one herd in Lages, Santa Catarina State. This study aimed to uncover the reasons for the recurring abortions in the Flemish cattle herd.
Materials and Methods: Seventeen Flemish fetuses underwent postmortem examinations, with samples collected for histopathology and microbiology culture tests, polymerase chain reaction (PCR) test for Neospora caninum, and reverse transcription-PCR (RT-PCR) test for bovine viral diarrhea virus (BVDV) from 2015 to 2020.
Results: Of the 17 fetuses, N. caninum was the most common diagnosis and was found in 88% (15/17). One fetus (5.8%) had a coinfection with N. caninum and Citrobacter amalonaticus, leading to fibrinonecrotic pericarditis. All fetuses tested negative for BVDV by RT-PCR. Of the 107 dams tested by indirect immunofluorescence assay, 26 (25.2%) were anti-N. caninum seropositive, with 17 (65.4%) aborting and 5 (19.2%) having estrus repetition. Reverse transcription-PCR results showed that 9 (8.4%) of the serum samples collected from dams tested positive, which tested follow-up test 3 months later, indicating a BVDV transient infection. The factors that contributed to neosporosis included dogs’ access to pastures and improper disposal of fetal remains, which made it easier for dogs to consume them.
Conclusion: This study warns the occurrence of N. caninum as a cause of reproductive disorders that can lead to abortion in the studied Flemish cattle herd.
Keywords: abortion, endangered breeds, pathology, protozoan, reproductive disorders.
Funder
Fundação de Amparo à Pesquisa e Inovação do Estado de Santa Catarina
Publisher
Veterinary World
Subject
General Veterinary
Reference41 articles.
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