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A sampling of factors relative to the epidemiology of gastrointestinal nematode parasites of cattle in the United States.

Abstract
Gastrointestinal nematodosis of cattle is a parasitic condition resulting from an immense and seemingly forever-expanding array of factors. Countless determinants influence the incidence and severity of the species-specific infections that occur in cattle, determinants that affect the free-living or environmental stages of the parasites and the parasitic stages. The vast majority of animals have a subclinical or economic level of parasitism undetectable to the eye but quantified more accurately by treatment-induced improved performance (e.g., feed efficiency, nitrogen balance, weight gain, milk production). Unfortunately, the results of treatment (effectiveness and improved animal performance) sometimes can be as varied as the parasitisms that are being treated.
AuthorsThomas A Yazwinski, Chris A Tucker
JournalThe Veterinary clinics of North America. Food animal practice (Vet Clin North Am Food Anim Pract) Vol. 22 Issue 3 Pg. 501-27 (Nov 2006) ISSN: 0749-0720 [Print] United States
PMID17071350 (Publication Type: Journal Article, Review)
Topics
  • Animals
  • Cattle
  • Cattle Diseases (epidemiology, etiology)
  • Intestinal Diseases, Parasitic (epidemiology, etiology, veterinary)
  • Life Cycle Stages
  • Nematode Infections (epidemiology, etiology, veterinary)
  • Prevalence
  • Risk Factors
  • Severity of Illness Index
  • Species Specificity
  • United States (epidemiology)

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