A consideration on the relationship between worm age and mortality of Setaria marshalli recovered from the peritoneal cavity of calves born in Tottori prefecture, Japan.
Eight calves born in November-December of 1992 were necropsied at the age of 29-230 days in an attempt to estimate the life span of Setaria marshalli in Japan. Worm ages were estimated on the base of active season for mosquitoes. Thirty worms estimated 4-9 months old recovered from 4 calves were all alive in the peritoneal cavity. Thirty-five out of 50 worms estimated 7-13 months old were dead with being entrapped by fibrin on the peritoneum. It is speculated that this is a normal fate of this parasite at the end of its life, and therefore, the life span of S. marshalli would be approximately one year after prenatal infection.
Fujii
T
T
Veterinary Teaching Hospital, Faculty of Agriculture, Tottori University, Japan.
Hayashi
T
T
Furuya
T
T
Taira
N
N
D000375:Aging / Q000502:physiology; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology / Q000469:parasitology*; D005260:Female; D007564:Japan / Q000453:epidemiology; D008297:Male; D010529:Peritoneal Cavity / Q000469:parasitology*; D015995:Prevalence; D017182:Setaria Nematode / Q000254:growth & development / Q000502:physiology*; D012719:Setariasis / Q000453:epidemiology / Q000469:parasitology*