| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 932.57 KB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
A claudicação é um dos problemas mais frequentes em explorações de bovinos leiteiros actualmente. As principais causas de claudicação são lesões podais, cuja detecção atempada pelos produtores é dificultada pelo comportamento estóico dos bovinos e pela falta de controlo rotineiro do estado das úngulas dos animais. Não sendo devidamente detectadas e tratadas, a lesão é perpetuada e progride para cronicidade. Consequentemente, encontra-se frequentemente associada a hiperalgesia, isto é, ao aumento da sensibilidade a estímulos nocivos, a qual pode ser primária, quando surge no local da lesão, e secundária, quando se manifesta também nos tecidos circundantes da lesão. Para além de afectar o bem-estar animal, a claudicação associa-se à diminuição da produção leiteira, diminuição da fertilidade, perda de condição corporal, aumento dos custos de tratamento e maneio animal e diminuição da longevidade. A rentabilidade da exploração é, assim, afectada, podendo o produtor sair lesado caso não consiga corrigir a situação o mais rápido possível. Este estudo visa averiguar a presença de hiperalgesia secundária no membro claudicante de uma vaca, através da comparação dos graus de tolerância à pressão entre membros afectados e membros saudáveis, com recurso à algometria digital. Foi seleccionada uma amostra total de 54 animais, dos quais 10 saudáveis, com boa conformação dos membros e sem alteração de marcha, constituindo o grupo de controlo, e 44 animais com algum sinal de claudicação e de lesão podal crónica num dos membros posteriores, tendo-se identificado qual o membro afectado e qual o membro saudável. Animais com lesões em ambos os membros foram excluídos. Realizaram-se 3 medições em cada membro posterior de cada animal, na região metatársica, para calcular o valor médio da sua sensibilidade à dor. Os membros saudáveis de vacas com claudicação não apresentaram diferença significativa em termos de pressão tolerada no metatarso relativamente a vacas saudáveis. Por outro lado, os membros claudicantes presentavam uma pressão tolerada no metatarso significativamente inferior face ao conjunto de todos os membros saudáveis (membros afectados: 4,92 ± 3,40 k1gf; membros saudáveis: 10,15 ± 2.14 kgf; p<0.01). Foi possível concluir que ocorre o desenvolvimento de hiperalgesia secundária em bovinos leiteiros com claudicação, o que realça a importância do diagnóstico e tratamento precoce de patologias podais, de modo a evitar o sofrimento dos animais e melhorar o rendimento da exploração
ABSTRACT - Evaluation of hyperalgesia caused by foot lesions in dairy cattle - Lameness is one of the most frequent problems in dairy cattle farms today. The main causes of lameness are hoof lesions, whose timely detection by farmers is hampered by the stoic nature of the cattle and by the lack of routine monitoring of the condition of the animals' hooves. If not properly detected and treated, the lesion is perpetuated and progresses to chronicity. As a consequence, hyperalgesia, i.e. increased sensitivity to noxious stimuli, is often present, which can be primary, when it arises at the site of the lesion, or secondary, when it manifests in the tissues surrounding the lesion. In addition to worsening animal welfare, lameness is associated with decreased milk production, decreased fertility, loss of body condition, increased animal care and management costs and decreased longevity. The profitability of the farm is thus affected if the problem is not quickly resolved. The aim of this study was to investigate the presence of secondary hyperalgesia in the claudicating limb of dairy cows by comparing the degrees of pressure tolerance between affected and healthy limbs using digital algometry. A total sample of 54 animals was selected, of which 10 were healthy, with good limb conformation and no gait alteration, constituting the control group, and 44 animals with some sign of lameness and chronic foot lesion on one hind limb, the affected limb and the healthy limb being identified. Animals with lesions in both limbs were excluded. Three measurements were taken on each hind limb of each animal, in the metatarsal region, to calculate the mean value of their pain sensitivity. Healthy limbs of cows with lameness did not show a significant difference in terms of tolerated metatarsal pressure compared to healthy cows. On the other hand, claudicating limbs had a significantly lower tolerated metatarsal pressure compared to all healthy limbs (affected limbs: 4.92 ± 3.40 kgf; healthy limbs: 10.15 ± 2.14 kgf; p<0.01). It was possible to conclude that secondary hyperalgesia occurs in dairy cattle with lameness, which emphasizes the importance of early diagnosis and treatment of foot diseases in order to avoid animal suffering and improve farm performance
ABSTRACT - Evaluation of hyperalgesia caused by foot lesions in dairy cattle - Lameness is one of the most frequent problems in dairy cattle farms today. The main causes of lameness are hoof lesions, whose timely detection by farmers is hampered by the stoic nature of the cattle and by the lack of routine monitoring of the condition of the animals' hooves. If not properly detected and treated, the lesion is perpetuated and progresses to chronicity. As a consequence, hyperalgesia, i.e. increased sensitivity to noxious stimuli, is often present, which can be primary, when it arises at the site of the lesion, or secondary, when it manifests in the tissues surrounding the lesion. In addition to worsening animal welfare, lameness is associated with decreased milk production, decreased fertility, loss of body condition, increased animal care and management costs and decreased longevity. The profitability of the farm is thus affected if the problem is not quickly resolved. The aim of this study was to investigate the presence of secondary hyperalgesia in the claudicating limb of dairy cows by comparing the degrees of pressure tolerance between affected and healthy limbs using digital algometry. A total sample of 54 animals was selected, of which 10 were healthy, with good limb conformation and no gait alteration, constituting the control group, and 44 animals with some sign of lameness and chronic foot lesion on one hind limb, the affected limb and the healthy limb being identified. Animals with lesions in both limbs were excluded. Three measurements were taken on each hind limb of each animal, in the metatarsal region, to calculate the mean value of their pain sensitivity. Healthy limbs of cows with lameness did not show a significant difference in terms of tolerated metatarsal pressure compared to healthy cows. On the other hand, claudicating limbs had a significantly lower tolerated metatarsal pressure compared to all healthy limbs (affected limbs: 4.92 ± 3.40 kgf; healthy limbs: 10.15 ± 2.14 kgf; p<0.01). It was possible to conclude that secondary hyperalgesia occurs in dairy cattle with lameness, which emphasizes the importance of early diagnosis and treatment of foot diseases in order to avoid animal suffering and improve farm performance
Description
Dissertação de Mestrado Integrado em Medicina Veterinária, área científica de Clínica
Keywords
Bovinos leiteiros Lesões podais Hiperalgesia Bem-estar animal Dor Dairy cattle Foot lesions Hyperalgesia Animal welfare Pain
Pedagogical Context
Citation
Ribeiro AMM. 2024. Avaliação da hiperalgesia causada por lesões podais em bovinos de leite [dissertação de mestrado]. Lisboa: FMV-Universidade de Lisboa
Publisher
Universidade de Lisboa, Faculdade de Medicina Veterinária