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Age resistance in calves to Ostertagia ostertagi and Cooperia oncophora
Veterinary Parasitology, 1991Calves 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. +2 more
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Cooperia pectinata(Nematoda: Trichostrongylidae) in New Zealand
New Zealand Veterinary Journal, 1981Abstract Cooperia pectinata, a nematode parasite hitherto undetected in New Zealand, was recovered from the small intestine of a six-month-old red deer (Cervus elaphus) born on a deer farm in Taihape. The source of this infection is unknown but it seems likely that it originated from feral stock.
P B, McKenna +2 more
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Studies on arrested development of Ostertagia ostertagi and Cooperia oncophora
Journal of Comparative Pathology, 1974Abstract Stocks of Ostertagia ostertagi from five different sources and of Cooperia oncophora from four were used in experiments on the causes of arrested development. Paddocks were contaminated by calves infected with one stock of each species and subsequently grazed for short periods by test calves and the proportion of worms arrested at the early ...
J F, Michel, M B, Lancaster, C, Hong
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Efficacy of ivermectin against Cooperia curticei infection in sheep
American Journal of Veterinary Research, 1988SUMMARY Lambs were inoculated with a single dose of Cooperia curticei. Subcutaneous administration of ivermectin at a dosage of 200 μg/kg of body weight resulted in 61.1% and 90.4% anthelmintic efficacy, when measured at 7 and 14 days after treatment, respectively. In the treatment groups, parasites that remained were located more distally in the small
J A, Bogan +3 more
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The life history of Cooperia Pectinata Ransom
Australian Journal of Zoology, 1967Observations are reported on the morphology of the egg and infective larva, and on the development in calves of the parasitic stages of Cooperia pectinata Ransom. The third and fourth moults occurred 2 and 8 days, respectively, after infection. The pre-patent period was 13-14 days.
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Biology of Cooperia punctata (Nematoda: Trichostrongylidae) in the Domestic Rabbit
The Journal of Parasitology, 1965Young, domestic rabbits (Oryctolagus cuniculus), maintained under controlled conditions, are suitable hosts for the propagation of Cooperia punctata (v. Linstow, 1907) Ransom, 1907, an intes- tinal nematode parasite of domestic ruminants. Normal cooperid eggs, passed in the feces of infected rabbits, were cultured to secure characteristic infective ...
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The Journal of Parasitology, 1971
A series of experiments was conducted to determine if hybridization could occur between members of 2 species of nematodes, Cooperia oncophora and C. pectinata, parasitic in ruminants. Fourth-stage C. oncophora of one gender and C. pectinata of the opposite gender in the same stage of development were injected into the duodenal lumina of helminth-free ...
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A series of experiments was conducted to determine if hybridization could occur between members of 2 species of nematodes, Cooperia oncophora and C. pectinata, parasitic in ruminants. Fourth-stage C. oncophora of one gender and C. pectinata of the opposite gender in the same stage of development were injected into the duodenal lumina of helminth-free ...
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