In the Netherlands an association between the parasite Dictyocaulus viviparous and the milk production and milk composition parameters has been analyzed. With production data from 126 herds tested positive for D. viviparous and 109 herds tested negative, the results show an average decrease in milk yield of 1.3 kg per cow. Also an average decrease 0.10% in milk fat was visible in herds with D. viviparous, however no change in protein was detected in the infected herds.

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SourcesJournal of Dairy Science