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Seroprevalência de Neospora caninum numa exploração de bovinos de leite na região norte de Portugal Continental
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Abstract(s)
Neospora caninum é um parasita protozoário intracelular obrigatório que causa perdas reprodutivas e
produtivas, sendo responsável por elevadas perdas económicas em bovinicultura. Este estudo foi
desenvolvido no sentido de estudar a seroprevalência de N. caninum e a sua influência nos parâmetros
produtivos e reprodutivos numa exploração de bovinos de leite na região Norte de Portugal Continental.
Foram analisadas 100 amostras de soro através de testes de ensaio por imunoabsorção enzimática
(ELISA) para N. caninum. A seroprevalência na exploração foi de 28% (28/100, 95% CI: 19,70 – 38,01).
Verificou-se uma diferença significativa na variável ‘produção’ e ‘tempo de gestação’ entre os animais
seropositivos e os animais seronegativos (P-value=0,007 e P-value=0,01), respetivamente. Já na
variável ‘abortos’, verificou-se uma correlação de P-value=0,07 e (Odd ratio) OR=3,77 (95% CI).
Também se pode concluir que existem diferenças no número de inseminações artificiais e de intervalo
entre partos, concluindo-se que são necessárias 1,56 vezes mais inseminações artificias (IA) para que
ocorra gestação nos animais seropositivos. Já o intervalo entre partos (IEP) médio foi de 415 dias nos
animais positivos e de 385 em animais negativos. Com isto, pode concluir-se que N. caninum afeta
negativamente os parâmetros produtivos e reprodutivos das explorações de bovinos de leite.
Neospora caninum is an obligatory intracellular protozoan parasite that causes reproductive and productive losses, being responsible for significant economic losses in cattle. This study was conducted to investigate the seroprevalence of N. caninum and its influence on productive and reproductive parameters in a dairy cattle farm in the northern region of mainland Portugal. One hundred serum samples were analyzed using enzyme-linked immunosorbent assay (ELISA) tests for N. caninum. The seroprevalence in the farm was 28% (28/100, 95% CI: 19.70 – 38.01). A significant difference was observed in ‘production’ and ‘gestation length’ variables between seropositive and seronegative animals (P-value=0.007 and P-value=0.01), respectively. Regarding the ‘abortions’ variable, a correlation of Pvalue=0.07 and odd ratio (OR) of 3.77 (95% CI) were found. It can also be concluded that there are differences in the number of artificial inseminations (IA) and the calving interval, with seropositive animals requiring 1.56 times more IA for successful pregnancy. The mean calving interval (IEP) was 415 days in positive animals and 385 days in negative animals. Therefore, it was concluded that the N. caninum parasites has a negative impact on the productive and reproductive parameters of dairy cattle farms.
Neospora caninum is an obligatory intracellular protozoan parasite that causes reproductive and productive losses, being responsible for significant economic losses in cattle. This study was conducted to investigate the seroprevalence of N. caninum and its influence on productive and reproductive parameters in a dairy cattle farm in the northern region of mainland Portugal. One hundred serum samples were analyzed using enzyme-linked immunosorbent assay (ELISA) tests for N. caninum. The seroprevalence in the farm was 28% (28/100, 95% CI: 19.70 – 38.01). A significant difference was observed in ‘production’ and ‘gestation length’ variables between seropositive and seronegative animals (P-value=0.007 and P-value=0.01), respectively. Regarding the ‘abortions’ variable, a correlation of Pvalue=0.07 and odd ratio (OR) of 3.77 (95% CI) were found. It can also be concluded that there are differences in the number of artificial inseminations (IA) and the calving interval, with seropositive animals requiring 1.56 times more IA for successful pregnancy. The mean calving interval (IEP) was 415 days in positive animals and 385 days in negative animals. Therefore, it was concluded that the N. caninum parasites has a negative impact on the productive and reproductive parameters of dairy cattle farms.
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Keywords
Bovinos Neospora caninum Parâmetros produtivos e reprodutivos Portugal Seroprevalência Dairy cattle Neospora caninum Portugal Productive and reproductive parameters; Seroprevalence