Addressing parasitism in the Intermountain West

Small ruminant animal production loss from barber pole worm (Haemonchus contortus) infection is well-documented in the Southeast and Northeast regions of the USA. At present, the extent of Barber Pole Worm infection in Inter-Mountain West flocks is unknown. However, there is growing suspicion that the geographical range of H. contortus infection is increasing and that resistance to deworming agents is on the rise. This phenomena will be accentuated as small, irrigated flocks increase and also as larger sheep operations are shifted from range to irrigated pasture production systems. For these reasons, the need for a proactive defense against H. contortus has been recognized. The National Cent

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