Results 101 to 110 of about 2,349 (153)
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Genetic evidence indicating that Cooperia surnabada and Cooperia oncophora are one species
International Journal for Parasitology, 1998Sequences of the second internal transcribed spacer (ITS-2) of ribosomal DNA were determined for the trichostrongylid nematodes Cooperia surnabada and Cooperia oncophora, to test the hypothesis that they represent one species. Also included for comparison were other morphologically distinct species within the genus, namely Cooperia punctata and ...
Neil Chilton, Robin B Gasser
exaly +3 more sources
Confirmation of resistance to ivermectin by Cooperia curticei in sheep
New Zealand Veterinary Journal, 2005To investigate the occurrence of resistance to a full dose of oral ivermectin by Cooperia curticei in sheep.Twelve lambs on a sheep and cattle property in the North Island of New Zealand were randomly allocated to one of two equal-sized groups. One group was treated orally with a single dose of ivermectin at the manufacturer's recommended dose rate of ...
Pb McKenna, P B McKenna
exaly +3 more sources
Cooperia punctata: Effect on cattle productivity?
Veterinary Parasitology, 2012 Cooperia spp. have become the most prevalent parasites in United States cow/calf operations as observed in the USDA NAHMS (National Animal Health Monitoring System) Beef Cow/Calf survey in 2008. This is at least in part due to the widespread use of macrocyclic lactones that have recently been shown to have a reduced activity against these parasites ...
Bert E, Stromberg +7 more
openaire +3 more sources
Journal of Parasitology, 1971
Nematode populations of female C. oncophora and C. surnabada were mated with male C. surnabada in experiments designed to obtain monospecific isolates of C. surnabada. These matings were accomplished by inoculating calves, via duodenal fistula, with a mixture of female fourth-stage C. oncophora and C. surnabada worms.
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Nematode populations of female C. oncophora and C. surnabada were mated with male C. surnabada in experiments designed to obtain monospecific isolates of C. surnabada. These matings were accomplished by inoculating calves, via duodenal fistula, with a mixture of female fourth-stage C. oncophora and C. surnabada worms.
exaly +3 more sources
Cooperia mcmasteri and Cooperia surnabada in the United States
Journal of Parasitology, 1958Willard W Becklund
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Cytology of Reproduction in Cooperia pedunculata
American Journal of Botany, 1953exaly +4 more sources
Establishment of Cooperia oncophora in calves
Veterinary Parasitology, 2018The establishment rate of Cooperia oncophora related to host age and previous infection was investigated in young calves. Calves of similar age were kept on a feed pad and allocated into multiple groups, based on their age and weight. Two groups (each n = 16) received trickle infections with an ivermectin-susceptible C.
Christian W. Sauermann +4 more
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Veterinary Parasitology, 2020
In Australia, Cooperia spp. are often overshadowed by parasites believed to be more pathogenic production-limiting nematodes. A rise in anthelmintic resistance and reports of reduced growth rates attributed to infection with Cooperia spp. in Europe increases the need to be able to monitor the presence of C. pectinata, C. punctata and C.
Emily Kate Francis +4 more
openaire +2 more sources
In Australia, Cooperia spp. are often overshadowed by parasites believed to be more pathogenic production-limiting nematodes. A rise in anthelmintic resistance and reports of reduced growth rates attributed to infection with Cooperia spp. in Europe increases the need to be able to monitor the presence of C. pectinata, C. punctata and C.
Emily Kate Francis +4 more
openaire +2 more sources
Studies on the pathogenicity ofCooperia curticeifor sheep
New Zealand Veterinary Journal, 1975Abstract Extract Cooperia curticei is commonly found in sheep in New Zealand, frequently in relatively large numbers. The pathogenicity of this nematode, for sheep has been the subject of few experimental studies; the evidence available suggests that C. curticei produces few pathological changes in sheep (Andrews, 1938), although it has been claimed to
J S, Ahluwalia, W A, Charleston
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