Loading...
Publication
Avaliação Clínica e Parasitológica de Ovinos da Raça Serra da Estrela Parasitados por Haemonchus Contortus, na Região Centro de Portugal
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 1.64 MB | Adobe PDF |
Advisor(s)
Abstract(s)
A raça ovina Serra da Estrela, fundamental na produção de queijo e carne Denominação de Origem
Protegida (DOP), tem grande importância económica regional. A sua produtividade depende do bem estar animal, sendo as parasitoses, como a haemonchose causada por Haemonchus contortus, um
nematode hematófago, um desafio encontrado nas explorações. O diagnóstico é feito por coprologia
e coprocultura e o controlo passa pelo uso de anti-helmínticos, embora o uso inadequado tenha levado
ao surgimento de resistências. Assim, a adoção de estratégias como o maneio sustentável e análises
coprológicas são cada vez mais importantes.
Este estudo visa caracterizar o parasitismo em ovinos Serra da Estrela e relacionar a carga parasitária
com indicadores clínicos, com o objetivo de propor recomendações para um controlo parasitário eficaz
e sustentável. Para o desenvolvimento deste estudo, durante o mês de abril de 2025, foram recolhidas
fezes e avaliados parâmetros clínicos (cor das mucosas, score fecal e condição corporal) de 275 ovinos
pertencentes às regiões de Seia e Oliveira do Hospital. As amostras fecais foram utilizadas para a
realização de exames coprológicos tais como método de McMaster e coprocultura para verificar a
existência de nematodes gastrointestinais.
Do total dos animais presentes no estudo, observou-se que 132 (48%) animais se encontravam
negativos em relação à presença de nematodes gastrointestinais, sendo que 143 (52%) apresentavam
um diagnóstico positivo. Dos animais positivos observou-se, através da realização de coprocultura, que
a maioria dos animais parasitados apresentavam uma infeção mista e que a espécie mais prevalente
era a Cooperia curticei. A presença de Haemonchus contortus foi detetada em sete explorações
pertencentes a Oliveira do Hospital e cinco explorações pertencentes a Seia.
Com base na análise estatística, foi possível constatar que existia uma associação significativa entre os
valores observados no teste de FAMACHA e o número de Ovos Por Grama de fezes (OPG), assim como
entre a presença e a quantidade de Haemonchus contortus e o valor de FAMACHA®. Para além disso,
também foi possível encontrar uma associação estatisticamente significativa entre a presença e a
quantidade de Haemonchus contortus e a condição corporal. Desta forma, e com base nos resultados
obtidos, podemos verificar que a realização do teste de FAMACHA® e a avaliação da condição corporal
podem ser ferramentas úteis e pouco dispendiosas para a avaliação do grau de parasitismo de uma
exploração, nomeadamente da presença de Haemonchus, permitindo assim o seu controlo de forma
mais eficaz.
The Serra da Estrela sheep breed, which is key to the production of PDO cheese and meat, is of great regional economic importance. Its productivity depends on animal welfare, and parasitosis, such as haemonchosis caused by Haemonchus contortus, a haematophagous nematode, is a challenge encountered on farms. Diagnosis is made by coprology and coproculture and control involves the use of anthelmintics, although inappropriate use has led to the emergence of resistance. Therefore, the adoption of strategies such as sustainable management and coprological analyses are increasingly important. This study aims to characterize parasitism in sheep of the Serra da Estrela breed and assess its relationship with clinical indicators to draw up practical recommendations for effective and sustainable parasite control. This study analysed 275 sheep from the Seia and Oliveira do Hospital regions. During the month of April 2025, faecal samples were collected from each of the animals and clinical parameters such as eye mucosa colour, faecal score and body score were assessed. The faecal samples were used to carry out coprological tests such as the McMaster method and coproculture to check for gastrointestinal nematodes. Of all the animals in the study, 132 (48%) were found to be negative for gastrointestinal nematodes, while 143 (52%) had a positive diagnosis. Of the positive animals, coproculture showed that the majority of parasitised animals had a mixed infection and that the most prevalent species was Cooperia curticei. The presence of Haemonchus contortus was detected in seven farms belonging to Oliveira do Hospital and five farms belonging to Seia. Based on the statistical analysis, it was possible to see that there was a significant association between the values observed in the FAMACHA® test and the number of Eggs Per Gram of feces (EPG), as well as between the presence and quantity of Haemonchus contortus and the FAMACHA® value. It was also possible to find a statistically significant association between the presence and quantity of Haemonchus contortus and body condition. In this way, and based on the results obtained, we can see that carrying out the FAMACHA® test and assessing body condition can be useful and inexpensive tools for assessing the degree of parasitism on a farm, thus enabling it to be controlled more effectively.
The Serra da Estrela sheep breed, which is key to the production of PDO cheese and meat, is of great regional economic importance. Its productivity depends on animal welfare, and parasitosis, such as haemonchosis caused by Haemonchus contortus, a haematophagous nematode, is a challenge encountered on farms. Diagnosis is made by coprology and coproculture and control involves the use of anthelmintics, although inappropriate use has led to the emergence of resistance. Therefore, the adoption of strategies such as sustainable management and coprological analyses are increasingly important. This study aims to characterize parasitism in sheep of the Serra da Estrela breed and assess its relationship with clinical indicators to draw up practical recommendations for effective and sustainable parasite control. This study analysed 275 sheep from the Seia and Oliveira do Hospital regions. During the month of April 2025, faecal samples were collected from each of the animals and clinical parameters such as eye mucosa colour, faecal score and body score were assessed. The faecal samples were used to carry out coprological tests such as the McMaster method and coproculture to check for gastrointestinal nematodes. Of all the animals in the study, 132 (48%) were found to be negative for gastrointestinal nematodes, while 143 (52%) had a positive diagnosis. Of the positive animals, coproculture showed that the majority of parasitised animals had a mixed infection and that the most prevalent species was Cooperia curticei. The presence of Haemonchus contortus was detected in seven farms belonging to Oliveira do Hospital and five farms belonging to Seia. Based on the statistical analysis, it was possible to see that there was a significant association between the values observed in the FAMACHA® test and the number of Eggs Per Gram of feces (EPG), as well as between the presence and quantity of Haemonchus contortus and the FAMACHA® value. It was also possible to find a statistically significant association between the presence and quantity of Haemonchus contortus and body condition. In this way, and based on the results obtained, we can see that carrying out the FAMACHA® test and assessing body condition can be useful and inexpensive tools for assessing the degree of parasitism on a farm, thus enabling it to be controlled more effectively.
Description
Keywords
Controlo Coprocultura FAMACHA Haemonchus contortus McMaster Ovinos Parasitismo gastrointestinal Resistências Serra da Estrela Control Coproculture Gastrointestinal parasitism Resistance Sheep