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.
Klíčová slova
Abstraktní
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.