Prevalence of large endoparasites at necropsy in horses infected with Population B small strongyles in a herd established in Kentucky in 1966

Parasitology Research
E T LyonsS S Collins

Abstract

Two closed horse herds (Old Lot 4 and Field 24), infected since 1966 with Population B small strongyles resistant to thiabendazole (TBZ) and phenothiazine (PTZ), were terminated in February, March, and May, 2005. At necropsy, only the large endoparasites were identified and counted. The number of horses on pasture was 14 (239 days of age to 23 years old) for Old Lot 4 and two (3 to 20 years old) for Field 24. The time of the last antiparasitic treatment, relative to the year (2005) of necropsy, was 26 years for Old Lot 4 and 9 years for Field 24 horses. Gasterophilus intestinalis third instars (three to 113 specimens/horse) were found in all 16 horses and second instars (one to two) in two horses. Gasterophilus nasalis third instars (one to three) were recovered from five horses. Parascaris equorum infections (23 to 144) were in four horses (239 days to 4 years old). Strongylus vulgaris were present in the large intestine (one to 155) of 13 horses from 239 days to 23 years old and in the cranial mesenteric artery (two to 79) in 10 horses from 239 days to 23 years old. Strongylus edentatus were in the large intestine (two to 101) of 12 horses, ranging in age from 2.5 to 23 years old and in the ventral abdominal wall (one to 53) ...Continue Reading

References

Aug 1, 1986·The Veterinary Clinics of North America. Equine Practice·H M Clayton
May 14, 1999·Parasitology Today·C J Proudman, A J Trees

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Citations

Apr 8, 2011·Parasitology Research·Barbara HinneyPeter-Henning Clausen
Sep 11, 2012·Parasitology Research·M B StudzińskaK Szczepaniak
Nov 5, 2013·Veterinary Parasitology·Charles E PittawayA Douglas Wilson
Nov 16, 2021·Tropical Animal Health and Production·Karel Gómez-CabreraMartin K Nielsen

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