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Epidemiology and control of equine strongylosis at Newmarket


, : Epidemiology and control of equine strongylosis at Newmarket. Equine Veterinary Journal 18(6): 447-452

Seasonal rises in mean faecal egg output were observed in grazing ponies in spring (578 eggs per gram) and in summer (930 epg) on 30 April and 2 September, respectivley, in untreated ponies. Pasture infectivity reached a peak of 18,486 third stage larvae (L3)/kg on 17 September, two weeks after peak egg counts, coincidental with abundant September rainfall (103.0 mm). Differentiation of infective larvae from pasture showed the cyathostomes (small strongyles) to be predominant, but Trichostrongylus axei assumed major importance from late August to October. The large strongyles were rarely detected: Strongylus vulgaris was found only once and S. edentatus only twice. The most effective parasite prophylaxis was achieved by twice weekly removal of faeces. In this group, concentrations of infective L3 on pasture reached a maximum of 1000 L3/kg, compared to 18,486 L3/kg for a control group and 4850 to 10,210 L3/kg for anthelmintic treatment groups. The removal of faeces increased the grazing area by about 50 per cent, by eliminating the characteristic separation of horse pasture into roughs and lawns. Spring and summer anthelmintic treatments of mature ponies with oxibendazole were effective in reducing the late season rise in pasture infectivity to 4850 L3/kg, but treatment of young ponies (mainly yearlings) with ivermectin every eight weeks or oxibendazole every four weeks resulted in pasture infectivity as high as 10,000 L3/kg. There was evidence of cyathostome resistance to benzimidazole drugs.

Accession: 001586885

PMID: 3803357

DOI: 10.1111/j.2042-3306.1986.tb03684.x

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Related references

Herd, R.P., 1986: Epidemiology and control of equine strongylosis at Newmarket. Seasonal rises in mean faecal egg output were observed in grazing ponies in spring (578 eggs per gram) and in summer (930 epg) on 30 April and 2 September, respectively, in untreated ponies. Pasture infectivity reached a peak of 18,486 third stage...

Herd R.P., 1986: Epidemiology and control of equine strongylosis at newmarket england uk. Seasonal rises in mean faecal egg output were observed in grazing ponies in spring (578 eggs per gram) and in summer (930 epg) on 30 April and 2 September, respectivley, in untreated ponies. Pasture infectivity reached a peak of 18,486 third stage...

Herd, Rp, 1985: Recent studies on the epidemiology and control of equine strongylosis. Society for Veterinary Epidemiology and Preventive Medicine: proceedings of a meeting held at the University of Reading on the 27th-28th and 29th of March 1985 edited by MV Thrusfield: 5

Baker, D.W., 1941: Control of equine strongylosis III The effect of pasture management on the development of strongylosis in foals. Under a system of rotational grazing of improved pastures the av. egg count of the feces of the foals was 74% < that of the 1938 foals and 45% < that of the 1939 foals. The rate of pickup of infection was 74% less in the 1940 foals than in t...

Anonymous, 1939: Control of equine strongylosis I The effect of natural factors on the development of strongylosis in foals

Britton, J.W.; Salisbury, G.W.; Baker, D.W., 1941: Control of Equine Strongylosis. Part III. The Effect of Pasture Management on the Development of Strongylosis in Foals. Under the system of rotational grazing and pasture management used, details of which are given, the average rate of pick-up by foals was 1: 119, 205, 287 eggs deposited by their dams. The lowest rate of pick-up was 1: 202, 500, 000 and the highest...

Anonymous, 1940: Control of equine strongylosis II The effect of anthelmintic treatment of mares on the development of strongylosis in foals

Baker, D.W.; Salisbury, G.W.; Britton, J.W., 1939: Control of Equine Strongylosis. Part I. The Effect of Natural Factors on the Development of Strongylosis in Foals. Egg counts were made over a period of 5 months on 12 purebred Percheron or Belgian mares with their foals. An age resistance to Strongyloides westeri was observed, and age resistance to Ascaris equorum was confirmed. The most outstanding observati...

Salisbury, G.W.; Baker, D.W.; Britton, J.W., 1940: Control of Equine Strongylosis. Part II. The Effect of Anthelmintie Treatment of Mares on the Development of Strongylosis in Foals. This paper gives the result of an experiment to observe the effect of treating mares for strongyle infestation during the winter before the birth of their foals. The group used were six Percheron and five Belgian mares and their foals; seven foale...

Salisbury, G.W.; Baker, D.W.; Britton, J.W., 1940: Control of equine strongylosis; Part II : The effect of anthelmintic treatment of mares on the development of strongylosis in foals. A reduction by anthelmintic treatment of the faecal strongyle egg-output of mares by 39% resulted in the mares' foals producing an egg-count 39% less than those of foals kept under natural conditions the previous year. The pasture condition w...