Causas de aborto bovino diagnosticadas no Setor de Patologia Veterinária da UFRGS de 2003 a 2011

Antoniassi, Nadia Aline Bobbi; Juffo, Gregory Duarte; Santos, Adriana da Silva; Pescador, Caroline Argenta; Corbellini, Luís Gustavo; Driemeier, David

doi:10.1590/s0100-736x2013000200004

Cited by 25 publications

(23 citation statements)

References 27 publications

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“…Pregnancy loss rates have proved lower when cows are vaccinated at least 30 days before FTAI, with a second dose at D0 (Aono et al 2013, Pereira et al 2013. In lactating beef cows, however, FTAI is typically started 30-45 days post-calving, requiring the initial vaccine dose to be administered in late pregnancy (potentially resulting in miscarriage) or shortly after parturition (with a risk of newborn death as a result of handling) (Antoniassi et al 2013). Experiment 2 of the present study revealed the feasibility of using two vaccination protocols -namely, VACGEST (vaccination on D0 and at 30 DPI) and VACPREV (vaccination on D0 and D11), which facilitates vaccination planning.…”

Section: Discussionmentioning

confidence: 99%

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Impact of vaccination on the reproductive performance of multiparous Nellore cows

Ferreira¹,

Fernandes

Silva

et al. 2018

Pesq. Vet. Bras.

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Two experiments were conducted to evaluate the impact of two vaccines on the reproductive performance of multiparous beef cows in Mato Grosso do Sul, Midwest Brazil. In Experiment 1,765 calved multiparous Nellore cows were subjected to the same fixed-time artificial insemination (FTAI) protocol and rebred. Ultrasound pregnancy diagnosis was performed 30 and 90 days post-FTAI (DPI). Rates of pregnancy and pregnancy loss were determined for three periods: from 30 to 90 DPI, from 30 DPI to calving, and from 90 DPI to calving. The cows were assigned to three groups with different vaccination protocols - namely, Group VACMULT (n=250): vaccine against bovine herpesvirus 1 (BoHV-1), bovine viral diarrhea virus (BVDV), and leptospirosis; Group VACL (n=245): vaccine against leptospirosis alone; Group NOVAC (n=270): no vaccination. Serum antibody titers for BoHV-1, BVDV, and leptospirosis, measured in 57 cows from each group indicated active infection, suggesting circulation of these pathogens in the herd. No differences in pregnancy rates were observed across groups. Pregnancy loss rates did not differ significantly across groups within any of the periods investigated (30 to 90 DPI, 30 DPI to calving, or 90 DPI to calving). In Experiment 2, two vaccination protocols for each vaccine were investigated. Group VACGEST was vaccinated on day zero of FTAI (D0) and again 30 days post-FTAI (30 DPI). Group VACPREV was vaccinated on D0 and again on the day of insemination (D11). No significant difference was observed between groups, or significant gestational loss in the group that received the second vaccine on the day of insemination. The results revealed that neither vaccine interfered with the reproductive performance of multiparous cows. No differences were observed between vaccination carried out on both D0 and D11 and that performed on both D0 and D30. The performance of the IBR/BVDV/Leptospirosis vaccine on the day of the artificial insemination did not cause adverse effects on the reproductive parameters.

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Section: Discussionmentioning

confidence: 99%

“…In most cases, the causes of these losses remain undetermined (Corbellini et al 2006, Antoniassi et al 2013). There are no conclusive studies on the efficiency of vaccination against IBR/BVDV/Leptospirosis in the prevention of reproductive losses caused by these diseases in cattle.…”

Section: Introductionmentioning

confidence: 99%

Impact of vaccination on the reproductive performance of multiparous Nellore cows

Ferreira¹,

Fernandes

Silva

et al. 2018

Pesq. Vet. Bras.

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“…Estas são amplamente estudadas, porém dentre esses distúrbios também são descritas afecções causados por plantas e outras toxinas. O desconhecimento da maioria dos seus mecanismos patogenéticos, faz com que sua importância não seja completamente reconhecida (James et al 1992, Lucena et al 2010, Riet-Correa et al 2012, Caldas et al 2011, Antoniassi et al 2013. Dessa forma, ainda se faz necessário o estudo detalhado das possíveis alterações reprodutivas causadas por princípios tóxicos de plantas e esse trabalho vem contribuir para o entendimento dessas interações.…”

Section: Discussionunclassified

Megalocitose de células luteínicas grandes de vacas prenhes com seneciose crônica

et al. 2015

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Diversas espécies de Senecio estão amplamente difundidas nas pastagens de propriedades rurais do Sul do Brasil. Criadores dessa região relatam quedas nos índices reprodutivos dos rebanhos bovinos, muitas vezes de causas não determinadas. Várias plantas tóxicas são capazes de causar alterações reprodutivas diretas e indiretas em bovinos em diversos países, incluindo o Brasil, no entanto seus mecanismos patogenéticos ainda são pouco compreendidos. O objetivo desse trabalho é descrever lesões ovarianas em vacas com seneciose crônica proveniente de propriedades rurais da mesorregião Sudoeste Rio-grandense. Foram estudados 21 casos positivos de seneciose crônica diagnosticados entre 2011 e 2014. O estudo revelou que a seneciose crônica é a principal causa de morte de bovinos adultos na região. Quatro vacas prenhes apresentaram lesões hepáticas clássicas da intoxicação por Senecio spp. Essas vacas tiveram seus ovários avaliados histologicamente e células luteínicas grandes (CLG) desses ovários apresentavam megalocitose e pseudoinclusões nucleares. Algumas CLG apresentaram núcleos com até 23,69μm de diâmetro e o aumento no tamanho desses núcleos foi significativamente maior que os de vacas controle. Conclui-se que a intoxicação por Senecio spp. causa alterações ovarianas em vacas e é possível que a intoxicação cause perdas reprodutivas nos rebanhos bovinas da região.

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“…Nos rebanhos bovinos brasileiros, a diversidade de condições de manejo, a falta de suporte laboratorial e o envio de fetos em autólise para necropsia dificultam o diagnóstico da etiologia do aborto, de maneira que faltam ainda muitas informações sobre as causas de aborto em bovinos no Brasil (Antoniassi et al 2013). Entre as diversas etiologias do aborto, destacam-se as de origem infecciosa, com abortos causados por protozoários, bactérias, vírus e fungos.…”

Section: Introductionunclassified

“…Abortos bacterianos são associados a Brucela abortus, Leptospira sp., Listeria monocytogenes e Campylobacter sp. (Varaschin & Wouters 2006, Alves et al 2011); já os de origem viral são relacionados ao Vírus da Diarreia Viral Bovina (VDVB) e ao Herpesvírus Bovino tipo I (HVB-1) (Varaschin & Wouters 2006, Antoniassi et al 2013.…”

Section: Introductionunclassified

Caracterização morfológica e imuno-histoquímica de lesões em casos de aborto bovino bacteriano e viral no sul de Minas Gerais

et al. 2014

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Lavras, from 1999Lavras, from to 2013. From 60 fetuses studied, 30 (50%) had microscopic lesions. From these, eight had lesions consistent with bacterial agents and three had lesions suggestive of viral agents. In the bacterial abortions, one fetus presented lesions compatible with leptospirosis, characterized by jaundice, cholestasis, lymphoplasmacytic intersticial nephritis, and tubular nephrosis. Seven fetuses had purulent pneumonia or bronchopneumonia and one of them had also fibrinous pleuritis and peritonitis; two of them presented positive immunostaining for Brucella abortus. One of the three fetuses with lesions of viral infection revealed positive imunostaining for bovine herpesvirus. The results showed that abortions of bacterial and viral origin occur in the Region of this study and prophylactic measures should be adopted on the farms. This study also demonstrates that immunohistochemistry associated with histopathology is a useful and viable tool for the diagnosis, especially when microbiological and/or serological tests are not available.

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Causas de aborto bovino diagnosticadas no Setor de Patologia Veterinária da UFRGS de 2003 a 2011

Cited by 25 publications

References 27 publications

Impact of vaccination on the reproductive performance of multiparous Nellore cows

Impact of vaccination on the reproductive performance of multiparous Nellore cows

Megalocitose de células luteínicas grandes de vacas prenhes com seneciose crônica

Caracterização morfológica e imuno-histoquímica de lesões em casos de aborto bovino bacteriano e viral no sul de Minas Gerais

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