Observations on the Bionomics of the Egg of Fasciola Hepatica

Temporal studies on Fasciola hepatica in Galba truncatula in the west of Ireland

“…As with the development of the intermediate host, moisture and temperature (>9.5 • C) are important factors influencing the development of the parasite from egg to miracdium (Rowcliffe and Ollerenshaw, 1960). Overall, moisture and temperature during May to October (Fig.…”

Variations in the survival of Fasciola gigantica eggs in bovine dung stored in the sun as opposed to the shade

“…In hindsight, it is unfortunate that the moisture content of the two dung heaps was not measured, as moisture has been shown to be an important factor influencing the survival of eggs of F. hepatica in dung during summer in Wales (Rowcliffe and Ollerenshaw, 1960). However, in this study it is unlikely that difference in moisture content between the two heaps contributed significantly to differences between the heaps in longevity of eggs of F. gigantica, as the heaps were large and the frequent falls of rain during the period of the trial ensured that dung was not subject to rapid desiccation.…”

Forecasting the incidence of fascioliasis from climatic data

“…High m o r t a l i t y r a t e s of eggs at low t e m p e r a t u r e s could s e v e r e l y l i m i t t h i s contribution. Rowcliffe and Ollerenshaw (1960) and Over (1971) s u g g e s t that, in p r a c t i c e , the s u r v i v a l of eggs deposited f r o m October to M a r c h is v e r y low. The p r e s e n t model could be v e r y e a s i l y modified on the lines of equation 4 to take account of this high m o r t a l ity r a t e if it w e r e p r e c i s e l y known.…”