A comparison of the spring-rise phenomenon in the faecal nematode-egg counts of housed sheep with that of sheep grazing infective pasture

Brunsdon, R.V.

doi:10.1080/00480169.1966.33655

Cited by 12 publications

(1 citation statement)

References 12 publications

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“…A possible cause of the increased susceptibility of the ewes at this time may have been the temporary lack of contact with establishing and developing parasites during the period when the moxidectin was effective. It has been shown that ewes isolated from fresh larval challenges during pregnancy and lactation have a prolonged periparturient rise (Brunsdon 1966).…”

Section: Discussionmentioning

confidence: 99%

Epidemiology of gastrointestinal nematode parasitism in a commercial sheep flock and its implications for control programmes

et al. 2008

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The epidemiology of nematode infections in a UK commercial crossbred sheep flock was studied from January 2004 to January 2005. The ewes were treated orally with moxidectin when they were turned out of the lambing shed on to nematode-contaminated pasture, and the lambs were treated orally with ivermectin throughout the summer in accordance with the farm's usual practice, with the aim of near-suppressive nematode control. The lactating ewes experienced a significant increase in faecal egg count during the early summer, after the period of persistence of the moxidectin treatment had ended. The ewes' and lambs' egg outputs were dominated by Teladorsagia species, despite the persistence of the effect of moxidectin against this genus. The gimmers (primiparous two-year-old ewes) had a significantly greater faecal egg count at lambing than the three- to four-year-old ewes, but the older ewes had significantly greater post-treatment increases. The population of Trichostrongylus species appeared to follow accepted epidemiological patterns, with no evidence of summer trichostrongylosis. In late summer and autumn the faecal egg output of the ewes was primarily due to large intestinal nematodes.

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Section: Discussionmentioning

confidence: 99%

Epidemiology of gastrointestinal nematode parasitism in a commercial sheep flock and its implications for control programmes

et al. 2008

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Arrested Development of Nematodes and some Related Phenomena

1974

Advances in Parasitology

170

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Seasonal changes in the level and composition of nematode worm burdens in young sheep

Brunsdon¹

1970

New Zealand Journal of Agricultural Research

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Seasonal changes in the level and composition of nematode burdens in young sheep during their first year were studied in successive lamb crops over a 3-year period. Post-mortem worm count data were obtained from groups of 10 lambs slaughtered at 28-day intervals throughout each of the 3 years. Eighteen nematode species were recorded-14 Strongylidae, 2 Trichinellidae, I Metastrongylidae, and I Rhabditidae. Seasonal patterns of infection by most species were relatively constant during the period of study. Peak infections of Nematodirus occurred in the spring. Of the principal trichostrongyle species, the patterns of infection by Haemonchus contortus, Ostertagia spp., Trichostrongylus spp. of the small intestine, and Chabertia ovina presented similarities; infections rose rapidly to a peak in late summer/early autumn, followed by an abrupt decline to low numbers in winter. Duration of infection by these species was similar. Infection by Cooperia curticei and T. axei extended over a longer period and formed the major part of the worm burdens in animals entering their second year.Species that attained numerical dominance were, in order of succession, Strongyloides papillosus, Nematodirus spp., Ostertagia spp., Trichostrongylus spp. of the small intestine, C. curticei, and/or T. axei. In late autumn/early winter, after peak flock infection, a "self-cure" type reaction occurred which resulted in rapid elimination of the major part of infections by most species.Throughout the course of infection each year the patterns of increase and decline of mean strongyle egg counts (Nematodirus excluded) and mean total strongyle worm burdens were of similar shape.Considerable within-flock variation was recorded in faecal egg counts and in both level and composition of infections; this emphasises the need for adequate diagnostic samples and for caution in their interpretation.

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A comparison of the spring-rise phenomenon in the faecal nematode-egg counts of housed sheep with that of sheep grazing infective pasture

Cited by 12 publications

References 12 publications

Epidemiology of gastrointestinal nematode parasitism in a commercial sheep flock and its implications for control programmes

Epidemiology of gastrointestinal nematode parasitism in a commercial sheep flock and its implications for control programmes

Arrested Development of Nematodes and some Related Phenomena

Seasonal changes in the level and composition of nematode worm burdens in young sheep

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