PASTEURELLOSIS TRANSMISSION RISKS BETWEEN DOMESTIC AND WILD SHEEP

摘要

Paper provided courtesy of Council for Agricultural Science and Technology (CAST). 2008. Pasteurellosis Transmission Risks between Domestic and Wild Sheep. CAST Commentary QTA2008-1. CAST, Ames, Iowa. Additional information can be found at www.cast-science. org. Disease has contributed significantly to the decline of bighorn sheep {Ovis canadensis) populations throughout much of western North America, decreasing many native herds to less than 10 percent of their historical size and imperiling some populations and subspecies (Valdez and Krausman 1999). According to historical accounts (e.g., Grinnell 1928; Honess and Frost 1942; Shillinger 1937; Warren 1910), epidemics in some locations coincided with the advent of domestic livestock grazing in bighorn ranges, suggesting that novel pathogens may have been introduced into some bighorn populations beginning in the 1800s.