On the Survival of Overwintering Bovine Gastrointestinal Nematode Larvae During the Subsequent Grazing Season

摘要

Large numbers of overwintering >Nematodirus helvetianus were shown to survive on Maritime marshland pastures throughout the ensuing grazing season, while the numbers of >Ostertagia ostertagi and >Cooperia oncophora declined rapidly after the first few weeks.It was concluded that pastures carrying heavy overwintering residual infections, particularly of >N. helvetianus, may be unsafe for susceptible cattle at any time during the following grazing season.