Results 121 to 130 of about 1,250 (174)

Genetic evidence indicating that Cooperia surnabada and Cooperia oncophora are one species

International Journal for Parasitology, 1998
Sequences 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 ...
Ian Beveridge, Robin B Gasser, Neil B Chilton   +2 more
exaly   +3 more sources

Confirmation of resistance to ivermectin by Cooperia curticei in sheep

New Zealand Veterinary Journal, 2005
To 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
exaly   +3 more sources

Cooperia mcmasteri and Cooperia surnabada in the United States

Journal of Parasitology, 1958
Willard W Becklund
exaly   +3 more sources

Which larvae are they? Use of single larva for the molecular confirmation of Cooperia pectinata and Cooperia punctata in Australian cattle

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, Janina McKay-Demeler, Nichola Eliza Davies Calvani, Denise McDonell, Jan Šlapeta   +4 more
openaire   +2 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, Louis C, Gasbarre, Audie, Waite, David T, Bechtol, Michael S, Brown, Nicholas A, Robinson, Erik J, Olson, Harold, Newcomb   +7 more
openaire   +2 more sources

Studies on the pathogenicity ofCooperia curticeifor sheep

New Zealand Veterinary Journal, 1975
Abstract 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
openaire   +2 more sources

Completion of the Life Cycle of Cooperia punctata In vitro

The Journal of Parasitology, 1971
L3 Cooperia punctata were cultivated in vitro to adult worms that laid large numbers of eggs; many of these eggs hatched to L1 and L2 and a few of the latter developed to L.. Parasitic stages were cultivated in Ae medium (38.5 C); free-living stages were cultivated in A-s medium at 27 C.
G L, Zimmerman, S E, Leland
openaire   +2 more sources

Resistance of Cooperia curticei against fenbendazole

Research in Veterinary Science, 1986
Resistance of Cooperia curticei against fenbendazole was demonstrated in The Netherlands. Experimental infection of lambs followed by intraruminal injection of 5 mg kg-1 showed a 100 per cent survival of the C curticei population. With an in vitro egg development assay LC50 values between 0.23 and 0.38 micrograms ml-1 thiabendazole were found.
openaire   +2 more sources

Exsheathment of infective larvae ofCooperia curticei

New Zealand Veterinary Journal, 1974
Abstract Extract Although exsheathment of the infective larvae of many strongylate nematode parasites of ruminants has been studied (Rogers, 1966), that of Cooperia curticei larvae has not. By analogy with other trichostrongylid species inhabiting the small intestine, they would be expected to exsheath in response to conditions provided by the abomasum,
J S, Ahluwalia, W A, Charleston
openaire   +2 more sources

Age resistance in calves to Ostertagia ostertagi and Cooperia oncophora

Veterinary Parasitology, 1991
Calves were infected repeatedly during a period of 6 weeks with Ostertagia ostertagi and Cooperia oncophora, at an age of 3, 6 or 9 months. The inoculations were performed during three periods, February-March, May-June and August-September, to account for possible seasonal effects or effects of larval batches.
Kloosterman, A., Ploeger, H.W., Frankena, K.   +2 more
openaire   +3 more sources