Results 191 to 200 of about 20,970 (221)

Resistance of Haemonchus contortus to thiophanate

Research in Veterinary Science, 1980
The 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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Vaccination of grazing calves with antigens from the intestinal membranes of Haemonchus contortus: effects against natural challenge with Haemonchus placei and Haemonchus similis

International Journal for Parasitology, 2014
A vaccine containing integral membrane glycoproteins from the intestine of Haemonchus contortus was evaluated in three groups of eight 5 months old grazing calves, naturally infected by Haemonchus similis, Haemonchus placei and other gastrointestinal nematodes.
Bassetto, C. C., Silva, M. R. L., Newlands, G. F. J., Smith, W. D., Ratti Junior, J., Martins, Cyntia Ludovico, Amarante, Alessandro Francisco Talamini do   +6 more
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Progress on vaccination against Haemonchus contortus

International Journal for Parasitology, 1995
Control 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, 1983
Abstract 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

2016
R. Laing, A. Martinelli, A. Tracey, N. Holroyd, J.S. Gilleard, J.A. Cotton   +5 more
  +4 more sources

Haemonchus contortus: Food of preinfective larvae

Experimental Parasitology, 1971
Abstract 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

2016
Sheep 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., Meeusen, E. N., González, J. F., Piedrafita, D. M.   +3 more
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Haemonchus contortus: Enzymes

Experimental Parasitology, 1970
Marvin B. Rhodes, Donald L. Ferguson, Connell L. Marsh   +2 more
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Haemonchus of ruminants

Veterinary Parasitology, 1984
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Variability in Haemonchus contortus larvae

2021
Coprological analysis allow the identification of parasitism of ruminants by trychostrongylid but not to species level. In order to know species implicated eggs must be cultured and larvae must develop on coproculture and mature to infective stage of L3.
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