Economic impact of nematode parasite infection of cattle. Gastrointestinal (GI) nematodes severely reduce the efficiency of raising cattle on pasture throughout the world. Even well managed dairy and beef herds that exhibit no outward signs of infection can show reduced milk production (Thomas et al., 1984; Gross et al., 1999) and retarded growth in young animals (Hawkins 1993 ; Ploeger et al., 1990). As a result, producers have become more reliant on drugs to control economic losses, and this has led to the appearance of anthelmintic resistant nematodes in cattle in New Zealand (Vermunt et al., 1995 ; Hosking et al., 1996) and Great Britain (Stafford and Coles, 1999).  Producers adopting “organic” husbandry programs have few options for parasite control, and as such nematode infections are one of the most economically important diseases for these producers. 

L. C Gasbarre, T. Sonstegard, C. P VanTassell, T. Padilha

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 13, , 13.07, 2002
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