Barber pole eggs and larvae love warm, moist conditions and hate cold or very hot, dry conditions 4. This is an important adaptation for keeping the worm around through cold winters when eggs and larvae don't survive well on pasture. As a result, we see an increase in parasite transmission from spring to fall. The worms require about three weeks to complete their life cycle. However, if large numbers of larvae are inactive and lying in the lining of the stomach and intestines, severe parasitism can occur within 7 to 10 days after deworming.
Diagnosis is made on symptoms and identification of worm eggs under a microscope.
At NCSU, animals are dewormed when the number of nematode eggs per gram of feces reaches 600 to 700. Dewormers Little change has occurred in recent years in the dewormers that are licensed for use in goats. In general, the efficacy of this product is regarded as low. Also, oxfendazole and albendazole have been associated with problems in pregnant sheep. When a worm becomes resistant to one product in this group it becomes resistant to all of them.