PMID: 1202415Dec 1, 1975Paper

Observations on the development of Haemonchus contortus in young sheep given a single infection

Parasitology
W J Coadwell, P F Ward

Abstract

Worm free lambs 2-4 months old were given a single infection of 50,000 Haemonchus contortus larvae. The changes in packed red cell volume were compared with those of uninfected sheep and the infected sheep were divided into two groups according to the rate of change of packed cell volume. In group 1, packed cell volume fell sharply from the 10th day of infection and the sheep eventually died. In group 2, the fall was less marked and the packed cell volume returned to normal after about 40 days. The rates of increase of parasite body length and dry weight were compared for the two groups. Parasites in group 1 sheep grew more slowly than their group 2 contemporaries. Accurate planning of metabolic studies on H. contortus was made possible by using this information to predict the course of an infection and the size of the worms. Parasite development was also measured in sheep for which the packed cell volume was not recorded. Computer analysis showed that adult worm length increase did not follow a simple growth pattern starting from the last ecdysis, but consisted of a rapid elongation followed by a simple negative exponential increase. Dry weight increase also followed a negative exponential during the second phase. Measurements...Continue Reading

References

Oct 1, 1964·Journal of Comparative Pathology·M G CHRISTIEW A CHARLESTON

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Citations

May 1, 1989·International Journal for Parasitology·B M WaglandD Ouwerkerk
Apr 1, 1993·International Journal for Parasitology·E A MunnC A Greenwood
Feb 1, 1982·Veterinary Parasitology·G A AlbersR van den Brink
Jan 1, 1984·Veterinary Parasitology·I H ArzounM F Hussein
Mar 1, 1990·Veterinary Parasitology·W A Rahman, G H Collins
Feb 1, 1981·Parasitology·P F WardN S Huskisson
Nov 20, 1998·Zentralblatt für Veterinärmedizin. Reihe B. Journal of veterinary medicine. Series B·M T Gómez-MuñozJ M Alunda
Dec 11, 2007·International Journal for Parasitology·P W HuntL J Anderson
Dec 18, 2014·Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária·Michelle Cardoso dos SantosAlessandro Francisco Talamini do Amarante
Jan 1, 1984·Critical Reviews in Food Science and Nutrition·D Tusé
Jul 16, 2010·Veterinary Medicine International·Leticia García-CoiradasMontserrat Cuquerella

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