Fatores de risco associados à ocorrência de anticorpos anti-Neospora caninum em fêmeas bovinas leiteiras da microrregião leste do estado de Antioquia - Colômbia
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2015-02-27
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Universidade Federal de Goiás
Resumo
Bovine neosporosis is a parasitic disease distributed worldwide, that causes large economic
losses due to abortions, low milk production, neonatal mortality and repeated estrus. Because
of the limited information from Colombia’s studies, we aimed to identify the risk factors
associated with this infection and to determine its seroprevalence for Antioquia's east region,
which is the largest milk producer state of the country. We collected 1,038 blood samples
from Holstein, Jersey and crossbred cows from 31 farms in five municipal districts. An
epidemiologic questionnaire was applied to the owner of each farm. For the determination of
seropositivity we employed indirect ELISA and for titration of positive samples we used the
indirect immunofluorescence assay test (cutoff ≥ 1:200). The soropositivity for N. caninum
was estimated to be 28.32% (294/1038). All properties had at least one positive animal with
frequencies of seropositivity ranging from 5.5% to 50%. Analysis of risk factors was
performed by Chi-square test (X²) and multiple logistic regression. The presence of dogs,
history of abortion, breed, age, replacement cattle purchase outside the farm, gestation,
repetition of estrus, type of milking and the presence of chickens on farms showed significant
association with seropositive animals by Chi-square test (X²=P<0.25) and were selected for a
final multivariable logistic regression model where the history of abortion (OR = 5.33, p
<0.001), age (OR = 1.7, p = 0.038), replacement cattle purchase outside the farm (OR = 1.54
p = 0.008) and manual milking (OR = 1.69, p = 0.0029) were identified as risk factors. These
findings record the first report of seroprevalence and risk factors for the region and allow us
to conclude that N. caninum is widely distributed in the evaluated properties and significantly
associated with these factors.
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LLANO, H. A. B. Fatores de risco associados à ocorrência de anticorpos anti-Neospora caninum em fêmeas bovinas leiteiras da microrregião leste do estado de Antioquia - Colômbia. 2015. 81 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2015.