Effect of experimental Ostertagia circumcincta infection on the performance of grazing lambs

Coop, R.L.; Graham, Robert B.; Jackson, F.; Wright, Steve; Angus, K.W.

doi:10.1016/s0034-5288(18)31795-8

Cited by 71 publications

(24 citation statements)

References 18 publications

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“…We used an estimated reduction in live weight of proportionately 0·146, resulting in a cost of £64 million. This estimate is based on the average of the lowest (6·2% weight reduction, Coop et al (1985)) and highest (0·23 reduction, Mackay et al, 1998) estimates and the average is close to weight reductions estimated by Coop et al (1985) of 0·12 and 0·17 for high infestation levels, with or without anthelmintic treatments. The range in weight reductions is very wide.…”

Section: Discussionsupporting

confidence: 54%

“…This reflects the difficulty in measuring the impact of GI parasites on performance. Coop et al (1982 and1985) used lambs that were kept clean until the start of the experiment at 15 and 17 weeks of age and given exact doses of larvae. Mackay et al (1998) observed effects within a system, so that the challenge and treatments better reflect normal conditions, but they are also less well controlled.…”

Section: Discussionmentioning

confidence: 99%

“…Based on data published by Coop et al (1982 and1985), a near-linear relationship appears to exist between infestation level (measured faecal egg count, FEC) and reduction in performance. Assuming a linear relationship between FEC, performance and anthelmintic requirements, a reduction in FEC levels of proportionately 0·10 would decrease costs by 0·10 or £8·4 million per annum.…”

Section: Impact Of Reductionsmentioning

confidence: 99%

“…Estimates for reductions in the final weight of lambs due to GI parasite infestation range from proportionately 0·062 to 0·23 (Coop et al, 1985;Mackay et al, 1998). The costs for one anthelmintic treatment are estimated as £0·20 for medicines (based on http : //www.farmpharmacy.co.uk) and £0·159 for labour (http : //www.apd.rdg.ac.uk/AgEcon/ livestockdisease/sheep/Sheep disease spreadsheets.xls).…”

Section: Data Sources and Calculationsmentioning

confidence: 99%

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Costs of the major endemic diseases of sheep in Great Britain and the potential benefits of reduction in disease impact

2005

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The costs of three major endemic sheep diseases in Great Britain, gastro-intestinal (GI) parasites, footrot and scab, were estimated and compared with costs for other diseases from another study. Disease costs include lost performance, preventive measures and treatment of affected animals. The most costly disease, of those studied, for the British sheep industry is infestation with GI parasites, with estimated annual costs of £84 million. Annual costs for the other two diseases are £24 million for footrot and £8 million for sheep scab. This compares with literature estimates of £20 million for Chlamydial abortions and £12 million for toxoplasmosis. For sheep scab most costs are for preventive measures, therefore, short of eradication, a reduction in incidence will have a limited effect on costs. For GI parasites, costs are linearly related to the severity of the infestation and a reduction of the disease will have a proportional effect on the costs to the industry. For footrot about half the costs are for preventive measures, the other half is for lost production and treatment. A reduction in the incidence of footrot has a proportional effect on the £10 million associated with loss of production and treatment of infected animals. It is concluded that gastro-intestinal parasites and footrot are two sheep diseases inBritain for which a reduction of severity or incidence will have a large impact on costs of production.

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Impact Of Reductionsmentioning

confidence: 99%

Section: Data Sources and Calculationsmentioning

confidence: 99%

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Costs of the major endemic diseases of sheep in Great Britain and the potential benefits of reduction in disease impact

2005

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“…Even in temperate sheep-producing regions, such infections can cause health and welfare problems. For example, ovine ostertagiosis (due to infection with the GI nematode Teladorsagia circumcincta ) is a major constraint upon the productivity of growing lambs in the UK, with even sub-clinical infections causing marked decreases in productivity (Coop et al ., 1982 and1985). However, effective control of GI nematode parasites is becoming more difficult.…”

Section: Introductionmentioning

confidence: 99%

Genetic parameters for resistance to nematode infections in Texel lambs and their utility in breeding programmes

et al. 2004

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This paper addresses the inheritance of host resistance to gastro-intestinal nematode parasite infections in commercial Texel lambs, and the rôle of resistance to parasites in breeding programmes. In two flocks of Texel sheep, faecal egg counts following natural parasite challenge were measured on up to three occasions post weaning per lamb over a 4-year period, with 1385 and 287 lambs measured on the two farms. Live weight, and ultrasonically measured fat and muscle depth at weaning were available for each lamb, as were deep pedigrees. Egg counts were moderately to strongly heritable on all occasions, with Nematodirus egg counts more heritable than the Strongyle egg counts. Weighted average heritabilities for Strongyle and Nematodirus egg counts were 0·26 and 0·38, respectively. Within the same category of parasite, genetic correlations across time were positive and strong but somewhat less than unity, as were the correlations between Strongyle and Nematodirus egg counts measured at the same time. Genetic correlations between performance traits and Strongyle egg counts were usually favourable (i.e. negative) but weak, whereas those with Nematodirus egg counts were generally neutral or slightly positive. Whilst Nematodirus resistance may not necessarily be included in a breeding goal, the results suggest that Nematodirus egg counts can be used as an additional genetic indicator of Strongyle egg counts, at little extra cost. Including the epidemiological consequences of decreasing Strongyle egg counts in benefits of increasing parasite resistance, it is suggested that under UK conditions selection goals that place equal emphasis on live weight and log-transformed egg counts will be a robust means of improving growth rate and decreasing parasite larval challenge.

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Population regulation in trichostrongylids of ruminants

Barger

1987

International Journal for Parasitology

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Effect of experimental Ostertagia circumcincta infection on the performance of grazing lambs

Cited by 71 publications

References 18 publications

Costs of the major endemic diseases of sheep in Great Britain and the potential benefits of reduction in disease impact

Costs of the major endemic diseases of sheep in Great Britain and the potential benefits of reduction in disease impact

Genetic parameters for resistance to nematode infections in Texel lambs and their utility in breeding programmes

Population regulation in trichostrongylids of ruminants

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