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Browsing by Author "Duncan, J.L."
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The genetic basis of resistance to Ostertagia circumcincta in lambs
Stear, M.J.; Bairden, K.; Bishop, S.C.; Buitkamp, J.; Duncan, J.L.; Gettinby, G.; McKellar, Quintin; Park, M.; Parkins, J.J.; Reid, S.W.J. (1997-09)The relationship between Ostertagia (Teladorsagia) circumcincta and sheep is one of the best understood host-parasite relationships in any species. The key components of resistance have been quantified, the extent of genetic ... -
How hosts control worms
Stear, M.J.; Bairden, K.; Duncan, J.L.; Holmes, P.H.; McKellar, Quintin; Park, M.; Strain, S.; Murray, M.; Bishop, S.C.; Gettinby, G. (1997-09-04)Nematodes are a major cause of disease and death in humans, domestic animals and wildlife. Understanding why some individuals suffer severely whereas others exposed to the same infection remain healthy may assist in the ... -
The influence of dietary supplementation with urea on resilience and resistance to infection with Haemonchus contortus
Wallace, D.S.; Bairden, K.; Duncan, J.L.; Eckersall, P.D.; Fishwick, G.; Gill, M.; Holmes, P.H.; McKellar, Quintin; Murray, M.; Parkins, J.J. (1998-01)Previous research has indicated that supplementing an apparently adequate diet with additional protein improves both host resistance and resilience in lambs infected with Haemonchus contortus. The present study tested the ... -
The influence of increased feeding on the susceptibility of sheep to infection with Haemonchus contortus
Wallace, D.S.; Bairden, K.; Duncan, J.L.; Eckersall, P.D.; Fishwick, G.; Holmes, P.H.; McKellar, Quintin; Mitchell, S.; Murray, M.; Parkins, J.J. (1999-10)Previous research has shown that supplementing the diet of growing lambs with urea enhances their ability to withstand gastrointestinal infection with the nematode Haemonchus contortus. This study compared lambs given two ... -
The influence of relative resistance and urea-supplementation on deliberate infection with<i> Teladorsagia circumcincta during winter
Stear, M.J.; Bairden, K.; Duncan, J.L.; Eckersall, P.D.; Fishwick, G.; Graham, P.A.; Holmes, P.H.; McKellar, Quintin; Mitchell, S.; Murray, M. (2000-12-20)The consequences for lambs of infection over the winter with Teladorsagia circumcincta were quantified by deliberate, trickle infection of selected animals at 7 months of age. Infected and control uninfected animals were ... -
Influence of soyabean meal supplementation on the resistance of Scottish Blackface lambs to haemonchosis
Wallace, D.S.; Bairden, K.; Duncan, J.L.; Fishwick, G.; Gill, M.; Holmes, P.H.; McKellar, Quintin; Murray, M.; Parkins, J.J.; Stear, M. (1996-03)Protein supplementation improves the resistance of sheep to haemonchosis. This experiment investigated the Scottish blackface breed to establish whether dietary protein supplementation is still beneficial in a genetically ... -
Influence of supplementation with dietary soyabean meal on resistance to haemonchosis in Hampshire Down lambs
Wallace, D.S.; Bairden, K.; Duncan, J.L.; Fishwick, G.; Gill, M.; Holmes, P.H.; McKellar, Quintin; Murray, M.; Parkins, J.J.; Stear, M.J. (1995-05)The influence of dietary protein supplementation on resistance to haemonchosis was examined in Hampshire down lambs fed either a basal diet or a diet supplemented with soyabean. At seven months of age the lambs were ... -
An ovine Major histocompatibility complex DRB1 allele is associated with low faecal egg counts following natural, predominantly Ostertagia circumcincta infection
Schwaiger, F.W.; Gostomski, D.; Stear, M.J.; Duncan, J.L.; McKellar, Quintin; Epplen, J.T.; Buitkamp, J. (1995-07)Infection with Ostertagia circumcincta is a major constraint on sheep production in temperate areas of the world. A potential control strategy is the use of genetically resistant sheep. Therefore we examined the association ... -
The repeatability of faecal egg counts, peripheral eosinophil counts, and plasma pepsinogen concentrations during deliberate infections with Ostertagia circumcincta
Stear, M.J.; Bishop, S.C.; Duncan, J.L.; McKellar, Quintin; Murray, M. (1995-03)Faecal egg counts, peripheral blood eosinophil counts and plasma pepsinogen concentrations were monitored during 2 successive, deliberate infections in 24 Scottish Blackface sheep. For all 3 techniques, the repeatability ...