Estudo das parasitoses gastrointestinais em bovinos leiteiros abatidos no matadouro da ilha de S. Miguel, Açores
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2018
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A bovinicultura leiteira da ilha de São Miguel representa 64,1% da produção do
arquipélago dos Açores e este representa 31,2% da produção nacional.
O parasitismo gastrointestinal em bovinos em sistemas extensivos aliado às
condições ambientais propícias ao seu desenvolvimento pode levar a grandes perdas
económicas. A intensidade da infeção parasitária, o sistema de produção e a idade dos animais
refletem-se na produção de leite e no peso da carcaça no matadouro.
Considerando-se o impacto que os parasitas gastrointestinais causam à bovinicultura,
o objetivo deste trabalho foi identificar e determinar a prevalência de parasitas
gastrointestinais em fêmeas bovinas com idade superior a 47 meses com pelo menos uma
parição (categoria D) da raça Holstein Frísia (HF) criados e abatidos em matadouro da Ilha de
São Miguel nos Açores. Foram utilizados métodos coprológicos qualitativos e quantitativos
para se determinar o parasitismo e estimar as possíveis perdas económicas na produção de
carne através da classificação destas carcaças no matadouro.
Das 120 amostras analisadas, observou-se o parasitismo por estrongilídeos
gastrointestinais (EGI) em 35,8% dos animais, infecções por Moniezia spp. em 5% e
coccidiose por Eimeria spp. em 7,5%. Ao se comparar o peso das carcaças em que se
observou a ocorrência de parasitose, constatou-se que os animais parasitados apresentavam
em média 17,40 kg a menos do que os animais não parasitados.
As perdas económicas associadas às parasitoses poderiam ser evitadas com medidas
profiláticas adequadas com base em análises parasitológicas frequentes. Realça-se o papel do
médico veterinário na sensibilização dos criadores para promover as boas práticas de controlo
das parasitoses.
Dairy cattle on the island of São Miguel represents 64.1% of the production of the Azores and this represents 31.2% of the national production. Gastrointestinal parasitism in cattle in extensive systems coupled with environmental conditions conducive to their development can lead to severe economic losses. The intensity of the parasite infection, the production system and the age of the animals are reflected in the milk production and the carcass weight in the slaughterhouse. The intensity of infection and loss of production associated with parasitism are reflected in carcass weight and milk production in extensive production systems. The objective of this study was to determine the prevalence of gastrointestinal parasites in dairy cows aged over 47 months Holstein Friesian (HF) breed (category D) with at least one calving and slaughtered in the São Miguel Island, Azores by coprological methods and performed an estimative of the loss resulting from rejected livers at the slaughterhouse. Parasitism by gastrointestinal strongyles (GIS) was observed in 35.8% of the animals, cestodosis by Moniezia spp. in 5% and coccidiosis in 7.5%. A significant weight difference was observed between carcasses of positive animals with averaging 17.40 kg less than negative animals. The rejection of livers was 97%, and may include parasitic causes. Economic losses associated with parasitic diseases could be avoided with appropriate prophylactic measures based on frequent coprological analysis.
Dairy cattle on the island of São Miguel represents 64.1% of the production of the Azores and this represents 31.2% of the national production. Gastrointestinal parasitism in cattle in extensive systems coupled with environmental conditions conducive to their development can lead to severe economic losses. The intensity of the parasite infection, the production system and the age of the animals are reflected in the milk production and the carcass weight in the slaughterhouse. The intensity of infection and loss of production associated with parasitism are reflected in carcass weight and milk production in extensive production systems. The objective of this study was to determine the prevalence of gastrointestinal parasites in dairy cows aged over 47 months Holstein Friesian (HF) breed (category D) with at least one calving and slaughtered in the São Miguel Island, Azores by coprological methods and performed an estimative of the loss resulting from rejected livers at the slaughterhouse. Parasitism by gastrointestinal strongyles (GIS) was observed in 35.8% of the animals, cestodosis by Moniezia spp. in 5% and coccidiosis in 7.5%. A significant weight difference was observed between carcasses of positive animals with averaging 17.40 kg less than negative animals. The rejection of livers was 97%, and may include parasitic causes. Economic losses associated with parasitic diseases could be avoided with appropriate prophylactic measures based on frequent coprological analysis.
Descrição
Orientação: Ana Maria Duque de Araújo Munhoz
Palavras-chave
MESTRADO INTEGRADO EM MEDICINA VETERINÁRIA, MEDICINA VETERINÁRIA, VETERINÁRIA, BOVÍDEOS, DOENÇAS PARASITÁRIAS, PARASITOLOGIA VETERINÁRIA, MATADOUROS, AÇORES, VETERINARY MEDICINE, BOVIDS, PARASITIC DISEASES, VETERINARY PARASITOLOGY, SLAUGHTERHOUSES, AZORES, SISTEMA DIGESTIVO, GADO LEITEIRO, DIGESTIVE SYSTEM, DAIRY CATTLE