| effect of environmental stimuli on pre-infective and infective stages of haemonchus contortus in the northern united states for the induction of hypobiosis. | the effects of both natural and artificial conditioning of pre-infective and infective stages of haemonchus contortus were examined in two studies with 108 crossbred lambs, using an ohio isolate of h. contortus known to exhibit up to 100% winter hypobiosis. the intensity of hypobiosis varied from 0 to 36% in 17 lamb groups given larvae subjected to various temperature and photoperiod conditions. the results in lambs given larvae conditioned for 4-8 weeks were not significantly different from tho ... | 1990 | 2353422 |