The development and mortality of the free-living stages of Haemonchus contortus in laboratory culture.
Haemonchus contortus eggs were cultured in intact fecal pellets at various temperatures (5-35 degrees C) for 22 days. Temperature and relative humidity were kept constant throughout the incubation period. Nl larval development occurred at 5 degrees C; peak third-stage larval recovery occurred at 20 degrees C. Egg mortality was an age-dependent phenomenon, whereas larval mortality remained constant irrespective of larval age. Development was characterized by a minimum development time followed by a transition to the next stage which occurred at a constant rate. All rates were temperature dependent. The minimum development times reported here are much less than those previously reported. Based on these results a mathematical model was used to describe the demography of the free-living stages of H. contortus at various temperatures.
Coyne
M J
MJ
SmithKline Beecham Animal Health, Exton, PA 19341.
Smith
G
G
D000818:Animals; D005243:Feces / Q000469:parasitology*; D006189:Haemonchus / Q000254:growth & development*; D006813:Humidity; D007814:Larva / Q000254:growth & development; D008954:Models, Biological; D009026:Mortality; D013696:Temperature