Results 191 to 200 of about 10,272 (227)
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Levamisole binding sites in Haemonchus contortus
International Journal for Parasitology, 1998Larval and adult extracts from isolates of Haemonchus contortus were assayed for specific [3H]levamisole binding activity. All of the tissue preparations displayed [3H]levamisole binding sites. The sensitive isolate SE and resistant isolate RJ showed no differences in larval and adult binding data. Larval SE extracts had higher receptor density (Bmax =
M J, Moreno-Guzmán +5 more
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International Journal for Parasitology, 1981
Abstract There were distinct ecotypie differences in the ability to develop to third stage larvae at a constant 11 or 13°C for two weeks. H. conforms cayugensis could develop at both 11 and 13°C; H. contortus from Louisiana could develop at 13°C but not 11°C and H. placei could not complete development at either temperature.
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Abstract There were distinct ecotypie differences in the ability to develop to third stage larvae at a constant 11 or 13°C for two weeks. H. conforms cayugensis could develop at both 11 and 13°C; H. contortus from Louisiana could develop at 13°C but not 11°C and H. placei could not complete development at either temperature.
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Resistance of Haemonchus contortus to thiophanate
Research in Veterinary Science, 1980The occurrence of a field strain of Haemonchus contortus which was resistant to thiophanate and susceptible to thiabendazole and levamisole is reported. The LD95 of thiophanate for the strain was found to be 156.1 mg/kg and its resistance factor was 6.7.
J R, Edwards, G, De Chaneet
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Progress on vaccination against Haemonchus contortus
International Journal for Parasitology, 1995Control of Haemonchus contortus at present is largely by the use of anthelmintics, assisted in some regions by management programs. Widespread development of resistance, particularly in South Africa and Australia, and concerns associated with the manufacture and use of chemicals have led to increasing interest in vaccination as an alternative means of ...
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Pre-mating barriers in hybrid Haemonchus
International Journal for Parasitology, 1983Abstract The F 1 (HX 1 ) from the mating of female Haemonchus placei (Hp) × male Haemonchus contortus (Hc) and the F 2 (HX 2 ) from the reciprocal mating, male Hp × female Hc, consist of sterile males and semi-sterile females. Infections in sheep of HX 2 established from 5000 larvae were found to exclude 90% of a subsequent H.
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Haemonchus contortus: Food of preinfective larvae
Experimental Parasitology, 1971Abstract Haemonchus contortus eggs were bacterially sterilized and cultivated in three different preparations of Escherichia coli cultures and a nutrient broth at 30 C for 7 days. The following percentages of infective larvae were recovered: supernatant fluid from E. coli culture, 0%; washed E. coli , 71%; heat-killed E.
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Immunity to Haemonchus contortus and Vaccine Development
2016Sheep are capable of developing protective immunity to Haemonchus contortus through repeated exposure to this parasite, although this immune protection is the result of a complex interaction among age, gender, physiological status, pregnancy, lactation, nutrition and innate and adaptive immunity in the host animal.
Nisbet, A. J. +3 more
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