Breeding for resistance to footrot – the use of hoof lesion scoring to quantify footrot in sheep

Conington, J.; Hosie, Brian; Nieuwhof, G.J.; Bishop, Stephen; Bünger, L.

doi:10.1007/s11259-008-9062-x

Cited by 35 publications

(37 citation statements)

References 7 publications

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“…Just as the profitability of meat, milk and fleece production drops due to foot diseases, serious economic losses are also experienced due to premature births and culling animals from the herds [11,[29][30][31][32] . It was observed that the general health of the animals visited, especially in the pen/stall season, was weak, and that the wool had fallen out from many different regions of their bodies.…”

Section: Discussionmentioning

confidence: 99%

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Mera Özellikleri ve Dönemsel Farklılıkların Koyun Ayak Hastalıkları Üzerine Etkileri: Kars ve Iğdır Yöresine Ait Saha Çalışması

Baran¹,

Yayla²,

Kiliç³

et al. 2015

Kafkas Univ Vet Fak Derg

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With this study, in which the incidences of diseases seen in sheep feet raised in the Kars and Iğdır regions were evaluated clinically and radiologically according to two different seasons, a total of 8.000 sheep were examined in the pasture (n=4230) and pen/stall (n=3770) seasons; problems were detected in 1.080 (25.51%) of them in the pasture season and 520 (13.76%) of them in the pen/stall season. It was determined that the herd in general suffered primarily from horn and hoof deformations in the pasture season with 17.70% and in the pen/stall season with 11.78%. Osteophyte formations and rotation were detected in the phalangeal bones of 20 of the sheep, and osteolysis was detected in the third phalanx of 8 of the sheep. In the aforementioned seasons, the rate of foot rot was 2.83% and 0.82% respectively. It was detected that according to the breed of sheep, 54.69% of the foot problems were seen in Akkaraman, 39.81% in Morkaraman, 1.43% in Tujin, and 4.07% in other sheep breeds (Merino, Kıvırcık). In addition, it was concluded that animal owners do not have sufficient knowledge concerning foot and hoof care, or do not care much about this issue. In conclusion, it was determined that the most important foot problem for sheep raised in the Kars and Iğdır regions is hoof deformation, and it was concluded that this could largely be avoided with simple precautions. Keywords

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Section: Discussionmentioning

confidence: 99%

“…Sheep foot diseases, which directly impact profitability due to the negative impact on animal welfare, pose a significant threat [6][7][8][9][10][11] . Because sheep have such a high tolerance of pain, as long as they do not have extreme foot lesions, they will not limp [9,12,13] .…”

Section: Introductionmentioning

confidence: 99%

Mera Özellikleri ve Dönemsel Farklılıkların Koyun Ayak Hastalıkları Üzerine Etkileri: Kars ve Iğdır Yöresine Ait Saha Çalışması

Baran¹,

Yayla²,

Kiliç³

et al. 2015

Kafkas Univ Vet Fak Derg

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“…It should be noted that the management group effect is confounded with the score date (with a group only scored on 1 or 2 successive days), so that the scorer by group effect may partly be a time effect. The repeatability of scorers has been investigated in a separate analysis (Conington et al, 2008) showing high consistency between scorers and between subsequent scores by the same scorer on the same day.…”

Section: Discussionmentioning

confidence: 99%

“…The scoring system described by Egerton and Roberts (1971) was implemented as described in detail by Conington et al (2008) and summarised in Table 1. Animals were inspected and awarded a score of 0 (healthy) to 4 (severe footrot) for each hoof, where a score of 1 may indicate scald or early stage footrot.…”

Section: Scoringmentioning

confidence: 99%

Genetic and phenotypic aspects of foot lesion scores in sheep of different breeds and ages

Nieuwhof

Conington²,

Bünger³

et al. 2008

Animal

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Footrot is a costly endemic disease of sheep. This study investigates the potential to decrease its prevalence through selective breeding for decreased lesion score. Pedigreed mule and Scottish Blackface (SBF) ewes were scored for lesions on each hoof on a 0 to 4 scale for up to 2 (SBF ewes) or 4 (mules) times over 2 years. One score was obtained for SBF lambs. An animal was deemed to have lesions (severe lesions) if at least one hoof had a score of at least 1 (2). The prevalence of lesions was 34% in lambs, 17% in SBF ewes and 51% in mules. The heritability of lesions (severe lesions) analysed as repeated measurements of the same trait in a threshold model was 0.19 (0.26) in SBF ewes and 0.12 (0.19) in mules. Estimates for the sum and maximum of scores as well as the number of feet affected were much lower, as were estimates for permanent animal effects (i.e. non-genetic effects associated with an animal). When successive scores on the same animal were analysed as correlated traits, heritability estimates for most traits tended to be higher, except for severe footrot in mules where estimates varied greatly over time. The phenotypic correlations between successive scores in SBF ewes were close to 0, genetic correlations were moderately positive (0.18 to 0.55). Correlations in mules were generally of a similar size, but some genetic correlations were higher (up to 0.92). There was a clear trend for heritabilities for lesions and severe lesions to increase with higher prevalence of lesions, even when analysed in a threshold model. Heritability estimates for traits that combine scores over several events in mules, identifying the more persistently affected animals, ranged from 0.12 to 0.23 with the highest estimates for the average number of feet that were (severely) affected in animals scored for a minimum at two events. The heritability of all lesion traits in lambs was estimated as 0. It is concluded that selection for lower lesions is possible in ewes but not lambs, and that a simple binary score at an animal level is at least as effective as a comprehensive score at hoof level. Given the low repeatability of lesion scores, repeated measures over time will improve effectiveness of selection. Selection across environments (flocks, seasons) with different prevalences of lesions scores will need to take account of variation in the heritability.

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“…Quanto à distribuição das lesões nos animais estudados, foi observado que os membros anteriores foram mais acometidos (57%) que os membros posteriores (23%) similar à observação de outros autores (Pugh 2004, Wenger 2007. Porém, existem estudos que descrevem uma maior incidência de lesões nos membros posteriores (Conington et al 2008). A presença de lesões nos membros anteriores faz com que os animais pastem ajoelhados, alteração comumente observada nas ovelhas utilizadas.…”

Section: Discussionunclassified

Evolução clínica e avaliação de parâmetros leucocitários e de proteínas de fase aguda na pododermatite infecciosa ovina

Carvalho

Araújo²,

Vasconcelos³

et al. 2012

Pesq. Vet. Bras.

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ABSTRACT.-Carvalho V.S., Araújo B.R., Vasconcelos T.C., Chiminazzo C., Costa Neto A.O., Ayres M.C.C., Guimarães J. In this paper, Santa Inês crossbred sheep with footrot were evaluated, checking the changes on leukogram and the acute phase proteins. In the ϐirst experiment, 70 females were divided into three groups according to their podal scores: a control group (G1) with score 0, scald group (G2) with score 1 or 2 and a footrot group (G3) with score 3, 4 or 5. During two months, the clinical course and its effect on leukogram were observed at ϐive moments: M1 (day 0), M2 (day 15), M3 (day 30), M4 (day 45) and M5 (day 60). The intensity of the white blood cell count was low magnitude, observing signiϐicant changes (p <0.05) as a mild leukocytosis (G3, M4), attributed to neutrophilia and a slight increase in the total number of monocytes (G3, M2 and M3) despite the extensive damage and tissue necrosis existed during the ϐinal stage of the disease. In the second experiment, 105 animals from seven farms were used with the objective of isolating the causative agent and to evaluate the effect of disease on total plasma protein and acute phase proteins. The animals were also divided into three groups: control, scald and footrot. In all farms, the isolation of Dichelobacter nodosus was regarded. For the different stages of the disease on the proteins studied there was no signiϐicant correlation (p<0.05) but the haptoglobin in scald and footrot groups showed higher average than the control group. Based on these results, we conclude that the acute phase proteins studied were not efϐicient in the characterization of the phases of the disease and the leukocyte response was mild, making it difϐicult to use for this purpose.

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Breeding for resistance to footrot – the use of hoof lesion scoring to quantify footrot in sheep

Cited by 35 publications

References 7 publications

Mera Özellikleri ve Dönemsel Farklılıkların Koyun Ayak Hastalıkları Üzerine Etkileri: Kars ve Iğdır Yöresine Ait Saha Çalışması

Mera Özellikleri ve Dönemsel Farklılıkların Koyun Ayak Hastalıkları Üzerine Etkileri: Kars ve Iğdır Yöresine Ait Saha Çalışması

Genetic and phenotypic aspects of foot lesion scores in sheep of different breeds and ages

Evolução clínica e avaliação de parâmetros leucocitários e de proteínas de fase aguda na pododermatite infecciosa ovina

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