Survival of infective larvae of nematode parasites of cattle during drought

Veterinary Parasitology
I A BargerG F Brown

Abstract

In a study originally designed to determine the seasonal origin of the high levels of availability of nematode larvae to cattle in winter and spring, plots were serially contaminated with eggs of Ostertagia ostertagi and Cooperia oncophora by naturally-infected calves at monthly intervals from February 1980 to September 1980. The availability of infective larvae was monitored by monthly pasture sampling and larval recovery. Because of the intervention of a 15 month drought, recoveries of larvae from the pastures were very low until March 1981 (autumn in Australia) when large numbers of larvae appeared on pastures contaminated in the preceding spring. Examination of dry dung pats at that time showed that significant numbers of larvae were present in pats deposited up to a year previously, and particularly in pats deposited in May, August and September. Following the resumption of normal rainfall in May 1981, larval numbers in pats rapidly declined and concentrations of larvae on the pastures increased to extremely high levels. It is suggested that survival of infective larvae in dry dung pats was enhanced by the drought, with implications for control of nematode infections of cattle, particularly in winter rainfall environments.

References

Dec 1, 1977·Australian Veterinary Journal·M G SmealH C Kirton
Jun 1, 1978·International Journal for Parasitology·A P Callinan
Feb 1, 1975·International Journal for Parasitology·I A Barger, W H Southcott
Feb 14, 1970·The Veterinary Record·J Armour
Feb 1, 1981·Australian Veterinary Journal·L F Le Jambre
Feb 1, 1980·Australian Veterinary Journal·M G SmealG C Fraser
Jan 1, 1962·Journal of Comparative Pathology·J H ROSE

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Citations

Jul 15, 1989·Veterinary Parasitology·P NansenK Sejrsen
Jul 3, 1998·International Journal for Parasitology·J H NiezenH A Robertson
Jul 31, 1997·Veterinary Parasitology·F S MalanJ A van Wyk
Oct 31, 2006·The Veterinary Clinics of North America. Food Animal Practice·Thomas A Yazwinski, Chris A Tucker
Oct 26, 2006·Journal of Veterinary Medicine. B, Infectious Diseases and Veterinary Public Health·C NogaredaM Cordero del Campillo

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