Species involved in ostertagiasis in calves

Authors: Bisset SA
Publication: New Zealand Veterinary Journal, Volume 28, Issue 3, pp 54, Mar 1980
Publisher: Taylor and Francis

Animal type: Cattle, Livestock, Production animal, Ruminant
Subject Terms: Alimentary system/gastroenterology, Nematode, Parasites - internal, Reproduction, Reproduction - male, Species description
Article class: Correspondence

---

Abstract: It has generally been accepted that, in New Zealand as in most other temperate countries, Ostertagia ostertagi is the only species of major significance involved in cattle ostertagiasis. Five species of Ostertagi were found in 75 cattle examined in New Zealand between 1958-1961: O. ostertagi, O. lyrata, O. crimensis, O. circumcincta and O. trifurcata; O. ostertagi was by far the most common of these, occurring in all animals, and comprising a mean of 88% of the number of Ostertagia found. O. lyrata and O. crimensis occurred, respectively, in 82% and 34% of the animals, but comprised a mean of only 5% and 7% of those burdens in which they occurred. Similarly, O. circumcincta and O. trifurcata, though present, were not of major importance, and are not generally considered to be characteristic parasites of cattle, their presence usually being related to mixed grazing of cattle and sheep…

---