Impact of the rumen fluke Calicophoron daubneyi on milk production parameters, β-hydroxybutyrate, fertility and feces consistency in southern German dairy cows.

The infection of cattle with the rumen fluke Calicophoron daubneyi has been detected with increasing frequency in Europe in recent decades. The question of the importance of this parasitic infection for milk production has come to the fore. While the influence on beef cattle has already been investigated in a few studies with contradictory results, there is hardly any knowledge about an influence on milk yield and fertility.