Parasites of Ovis canadensis canadensis in Montana, with a Checklist of the Internal and External Parasites of the Rocky Mountain Bighorn Sheep in North America

Becklund, Willard W.; Senger, Clyde M.

doi:10.2307/3276639

Cited by 17 publications

(5 citation statements)

References 9 publications

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“…These levels of infection would not be atypical across the range of bighorn sheep (Becklund and Senger 1967;Uhazy and Holmes 1971); comparable levels have been documented for Dall's sheep in Alaska (Nielsen and Neiland 1974). These levels are considered to be below that where substantial disease might be observed, but in a synergistic manner could become significant in the presence of other strongyles and malnutrition (Becklund and Senger 1967).…”

Section: Nematodirella]supporting

confidence: 73%

Gastrointestinal Strongyles in Wild Ruminants

Hoberg¹,

Kocan²,

Rickard³

2001

Parasitic Diseases of Wild Mammals

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Section: Nematodirella]supporting

confidence: 73%

Gastrointestinal Strongyles in Wild Ruminants

Hoberg¹,

Kocan²,

Rickard³

2001

Parasitic Diseases of Wild Mammals

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“…Becklund and Senger (1967) reported the bighorn sheep (Ovis canadensis) as a common host of 7: circumcincta and 7: trifurcata. Teladorsagia circumcincta has also been reported from mule deer by Jenson et al (1982) and Taber and Dasmann (1 958), and from muskoxen (Ovibos moschatus) by Gibbs and Tener (1958).…”

Section: Larvaementioning

confidence: 98%

Gastrointestinal helminths of woodland and barren ground caribou (Rangifer tarandus) in Canada, with keys to species

Fruetel¹,

Lankester²

1989

Can. J. Zool.

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A total of 21 species of parasitic helminths was recovered from wild and captive caribou. Gastrointestinal nematodes were represented by eight species of Ostertagiinae, four species of Nematodirinae, Trichostrongylus axei, T. vitrinus, Oesophagostomum venulosum, Trichuris ovis, Skrjabinema sp., and Capillaria sp. Other helminths included Dictyocaulus viviparus, Setaria yehi, and Moniezia sp. Nematodirus odocoilei, a common parasite of Odocoileus spp. is reported from caribou for the first time. Ostertagia leptospicularis is reported from North America for the first time. Illustrations and diagnostic keys are provided for the eggs, infective larvae, and adults of the gastrointestinal nematodes recovered from caribou.

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“…The present study revealed that DBS were infested with various gastrointestinal helminths (table 2). Many of these helminths have been found in bighorn sheep in Oregon (Kistner et al , 1977), Montana (Becklund & Senger, 1967) and British Columbia (Demarchi et al , 2000). However, studies from Canada and the United States of America show a wider variety of nematodes in bighorn sheep (e.g., Ostertagia spp., Marshallagia marshalli , Skrjabinema ovis , among others) than that observed in the present study.…”

Section: Resultsmentioning

confidence: 99%

“…It has been speculated that one of the decimating factors leading to the reduction of the population of DBS was the occurrence of diseases and parasites of domesticated sheep. Old reports have characterized the gastrointestinal nematodes of this species in Oregon (Kistner et al , 1977), Montana (Becklund & Senger, 1967) and British Columbia (Demarchi et al , 2000). More recently, it has been reported that Strongyloides spp.…”

Section: Introductionmentioning

confidence: 99%

Seasonal prevalence of gastrointestinal parasites in desert bighorn sheep (Ovis canadensis) in northern Mexico

et al. 2022

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This study aimed to describe the shedding pattern of gastrointestinal parasite eggs by a wild population of desert bighorn sheep (DBS; Ovis canadensis) in northern Mexico. Seventy-five fresh faecal samples were collected from the ground in each season within an hour after being expelled by these animals. The generalized linear mixed model showed that eggs per gram of faeces were highest in winter (577 ± 399) and lowest in summer (260 ± 198). Generalized linear models revealed that Strongyloides spp. predominated during most seasons with a peak in summer (85% of faecal samples analysed) and the absence of this helminth in winter. Nematodirus spp. was another helminth present in three seasons, with the presence of this nematode in 35% of the faecal samples in spring and 0% in summer. Other parasites in DBS faeces included Bunostomun spp., Trichostrongylus spp., Cooperia spp., Mecistocirrus digitatus, Haemonchus contortus, Chabertia ovina and Eimeria ovinoidalis. There were differences among seasons in the percentage of these helminths and coccidia in faecal samples for all these parasites. It was concluded that helminths egg output in DBS in a semi-arid rangeland is lowest in summer and spring and highest in autumn and winter. Furthermore, it was shown that DBS in the study site do not suffer from severe parasite burden. Therefore, this nematode parasite burden is compatible with the conservation and well-being of this particular population.

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Parasites of Ovis canadensis canadensis in Montana, with a Checklist of the Internal and External Parasites of the Rocky Mountain Bighorn Sheep in North America

Cited by 17 publications

References 9 publications

Gastrointestinal Strongyles in Wild Ruminants

Gastrointestinal Strongyles in Wild Ruminants

Gastrointestinal helminths of woodland and barren ground caribou (Rangifer tarandus) in Canada, with keys to species

Seasonal prevalence of gastrointestinal parasites in desert bighorn sheep (Ovis canadensis) in northern Mexico

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