Publications

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sarcocystis in feces of coyotes from montana: prevalence and experimental transmission to sheep and cattle. 1978104939
observations on epizootiology and distribution of elaeophora schneideri in montana ruminants.seventy-four moose, 111 elk, 20 mule deer, 8 white-tailed deer, 26 prong-horn antelope, 42 domestic sheep and 3 bighorn sheep from montana or northwestern wyoming were examined post-mortem for evidence of elaeophora schneideri infection in 1973-74. fifteen percent of the mule deer and four percent of the moose were positive for adult arterial worms. this constitutes the first report of e. schneideri in mule deer in montana. no gross signs of blindness or other neurologic disorder were evident in ...1975127848
serologic prevalence of toxoplasmosis in cattle, sheep, goats, pigs, bison, and elk in montana.serum samples from 2,539 cattle, 649 sheep, 123 goats, 413 pigs, 93 bison, and 56 elk from montana were examined for antibody to toxoplasma gondii in the sabin-feldman dye test or the modified agglutination test (mat). cattle, bison, and elk serum samples were treated with 0.2 m-mercaptoethanol before examination in mat. in the dye test, 13.2% of sheep, 5.0% of pigs, and 22.7% of goats had antibody at a dilution of greater than or equal to 1:16. in the mat, 3.2% of cattle, 3.1% of bison, and non ...19853997650
a skin test survey of tularemia in a montana sheep-raising county. 19694980174
tick-borne tularemia and tick paralysis in cattle and sheep. 19645217542
the occurrence of oestrus ovis l. (diptera: oestridae) in the bighorn sheep from wyoming and montana. 19665942536
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. 19676066758
experimental pasteurellosis: comparative studies on pasteurella multocida from asia, africa, and north america. 19676070947
muellerius capillaris (mueller, 1889) (nematoda: protostrongylidae): an unusual finding in rocky mountain bighorn sheep (ovis canadensis canadensis shaw) in south dakota.lungs and fecal samples from nine hunter-killed rocky mountain bighorn sheep were examined for lungworms. all samples contained adults and/or larvae of muellerius capillaris (mueller, 1889). protostrongylus spp., the lungworms commonly reported from bighorn sheep, were not present in any samples. larvae of m. capillaris bear a spine on the dorsal side of the posterior end and are shorter than dorsal-spined larvae of other lungworms recorded from north american ungulates. larvae similar in shape ...19846530714
coyote as a final host for sarcocystis species of goats, sheep, cattle, elk, bison, and moose in montana.tissues (1 kg) from sheep, goats, cattle, moose, bison, or elk naturally infected with sarcocystis species were fed to one to four sarcocystis-free coyotes and the number of sporocysts in feces and intestines were counted. all 12 coyotes fed naturally infected tissues shed sarcocystis in feces, with a prepatent period of 9 to 15 days. the four coyotes fed infected beef had 15, 25, 113, and 201 million sporocysts in their feces and intestines. the coyotes fed elk, moose, or bison had 2.5, 15, and ...19806778270
hosts and distribution of capillaria bovis (schnyder, 1906) in domestic and wild ruminants in northwestern united states. 19807420252
sex- and age-specific lungworm infection in rocky mountain bighorn sheep during winter.sex- and age-specific fecal lungworm (protostrongylus spp.) larvae concentrations in rocky mountain bighorn sheep (ovis canadensis canadensis) from the cinnabar winter range in southwestern montana were determined. all 228 fecal samples collected from bighorn sheep of known sex and age class from november to april, 1984 to 1987 contained first-stage lungworm larvae. fecal lungworm concentrations of ewes and rams declined significantly from late fall through early spring, whereas number of lungwo ...19938445795
influence of energy or protein supplementation during midpregnancy on forage intake of ewes grazing montana winter range.a 2-yr winter experiment was conducted to determine the influence of either energy or protein supplementation during midpregnancy on fecal output (fo), forage intake, blood metabolite profiles, and bw changes of ewes grazing winter range. thirty-two targhee ewes were selected for uniformity in age and bw and assigned randomly to one of four dietary treatments 1) no supplement (none); 2) 150 g of barley supplement (bar); 3) 75 of feather g meal, blood supplement (fm/bm); and 4) 75 g of fm, bm, ur ...19958617653
seasonal transmission of fasciola hepatica in montana, usa, with detection of infected intermediate hosts using a dna-based assay.a cashmere goat ranch in the beaverhead valley, southwest montana, usa reported acute fasciolosis in march 1992. the ranch was used as a study site to gather seasonal transmission data for the liver fluke, fasciola hepatica. testing of snails for infection with a nucleic acid-based assay, and use of tracer sheep at the site has shown the seasonal transmission of the parasite is only in late autumn. the snail responsible for transmission was identified as lymnaea modicella although another known ...19968983156
ecology of bacillary hemoglobinuria. 196414126858
comparison of three fecal steroid metabolites for pregnancy detection used with single sampling in bighorn sheep (ovis canadensis).we conpared three fecal steroid metabolite assays for their usefulness in detecting pregnalcy among free-ranging rocky mountain bighorn sheep (ovis canadensis canadensis) from bighorn canyon national recreation area, wyoming and montana (usa) and captive bighorn ewes at zoomontana in billings, montana. fecal samples were collected from 11 free-ranging, radio-collared bighorn ewes in late january-may 2001 and from 20 free-ranging, radio-collared ewes in late march to mid-may 2002. free-ranging ew ...200415362827
stochastic predation events and population persistence in bighorn sheep.many studies have reported temporal changes in the relative importance of density-dependence and environmental stochasticity in affecting population growth rates, but they typically assume that the predominant factor limiting growth remains constant over long periods of time. stochastic switches in limiting factors that persist for multiple time-steps have received little attention, but most wild populations may periodically experience such switches. here, we consider the dynamics of three popul ...200616777749
genetic characterization of anaplasma ovis strains from bighorn sheep in montana.wildlife reservoir species and genetic diversity of anaplasma ovis (rickettsiales: anaplasmataceae) have been poorly characterized. bighorn sheep (ovis canadensis), captured in montana from december 2004 to january 2005, were tested for antibodies to anaplasma spp.; the presence of a. ovis was determined by the characterization of major surface protein msp4 sequences. anaplasma antibodies were detected in 25/180 (14%) sampled bighorn sheep and a. ovis msp4 sequences were amplified by polymerase ...200616870861
the serologic prevalence of q fever (coxiella burnetii) complement-fixing antibodies in the peninsular bighorn sheep of southern california.q fever is a rare illness in the southern california desert. during the past 34 years only 6 patients have been diagnosed with the disease at the eisenhower medical center, a referral center for much of the desert and surrounding mountains. in all but 2 instances, q fever was identified in patients who have been in contact with imported domestic sheep who are brought to the desert to graze and lamb in the fall and winter. the sheep are sent back to idaho, wyoming, and montana in the spring. with ...200616896140
levels of abnormal prion protein in deer and elk with chronic wasting disease.chronic wasting disease (cwd) of deer and elk is a widespread health concern because its potential for crossspecies transmission is undetermined. cwd prevalence in wild elk is much lower than its prevalence in wild deer, and whether cwd-infected deer and elk differ in ability to infect other species is unknown. because lymphoid tissues are important in the pathogenesis of some transmissible spongiform encephalopathies such as sheep scrapie, we investigated whether cwd-affected elk and deer diffe ...200717553219
muellerius capillaris dominates the lungworm community of bighorn sheep at the national bison range, montana.lungworm infections are common among bighorn sheep (ovis canadensis) in north america, and the predominant species reported are protostrongylus stilesi and p. rushi. the only records of another lungworm species, muellerius capillaris, infecting bighorns come from south dakota, usa. at the national bison range (nbr), montana, usa we found that across six sampling periods, 100% of wild bighorn sheep surveyed were passing first-stage dorsal-spined larvae (dsl) which appeared to be consistent with m ...201020688711
investigation of a bluetongue disease epizootic caused by bluetongue virus serotype 17 in sheep in wyoming.to characterize a 2007 bluetongue disease (bt) epizootic caused by bluetongue virus (btv) serotype 17 in sheep in the big horn basin of wyoming.201020946084
genomic consequences of genetic rescue in an insular population of bighorn sheep (ovis canadensis).genetic rescue is a management intervention whereby a small population is supplemented with individuals from other populations in an attempt to reverse the effects of inbreeding and increased genetic load. one such rescue was recently documented in the population of bighorn sheep (ovis canadensis) within the national bison range wildlife refuge (montana, usa). here, we examine the locus-specific effects of rescue in this population using a newly developed genome-wide set of 195 microsatellite lo ...201222257293
a degree-day model of sheep grazing influence on alfalfa weevil and crop characteristics.domestic sheep (ovis spp.) grazing is emerging as an integrated pest management tactic for alfalfa weevil, hypera postica (gyllenhal), management and a degree-day model is needed as a decision and support tool. in response to this need, grazing exclosures with unique degree-days and stocking rates were established at weekly intervals in a central montana alfalfa field during 2008 and 2009. analyses indicate that increased stocking rates and grazing degree-days were associated with decreased crop ...201222420261
sequence analysis of the msp4 gene of anaplasma ovis strains.anaplasma ovis (rickettsiales: anaplasmataceae) is a tick-borne pathogen of sheep, goats and wild ruminants. the genetic diversity of a. ovis strains has not been well characterized due to the lack of sequence information. in this study, we evaluated bighorn sheep (ovis canadensis) and mule deer (odocoileus hemionus) from montana for infection with a. ovis by serology and sequence analysis of the msp4 gene. antibodies to anaplasma spp. were detected in 37% and 39% of bighorn sheep and mule deer ...200717052866
toxoplasmosis and other causes of abortions in sheep from north central united states.between 1983 and 1989, we examined 1,201 aborted fetuses and dead lambs from the north central united states. toxoplasmosis was diagnosed in 17.5%, campylobacteriosis in 9.9%, chlamydiosis in 4.7%, and miscellaneous infections in 15.1%. inflammatory lesions suggestive of infectious causes were seen in 13%. noninfectious causes were identified in 6.1%, and a diagnosis was not reached in 33.3%. an agglutination test was used to detect toxoplasma gondii-specific antibodies in ovine fluids. toxoplas ...19902298653
chlamydial-caused infectious keratoconjunctivitis in bighorn sheep of yellowstone national park.an epizootic of infectious keratoconjunctivitis occurred in bighorn sheep (ovis canadensis) in yellowstone national park during the winter of 1981-82. the causative organism was identified as chlamydia sp. mortality related to the epizootic was approximately 60% of an estimated 500 bighorn sheep in the northern range population. the infection probably affected all sex and age classes, but field surveys of live animals and mortality suggested that mature rams died disproportionately. limited fiel ...19921602566
effects of euphorbia esula l. (leafy spurge) on cattle and sheep in vitro fermentation and gas production.background: euphorbia esula l. (leafy spurge) is indigenous to eurasia and has been known to cause grazing aversion in ruminant species. as a result, e. esula encroachment has negatively impacted rangelands in the northern great plains and intermountain west of the usa, as well as southern canada. our objectives were to evaluate the effect of increasing concentrations of e. esula on in vitro dry matter digestibility (dmd) and gas production. two ruminally-cannulated cows and ewes were used as ru ...201121520450
tularemia in range sheep: an overlooked syndrome?abortion and death caused by francisella tularensis were well recognized in range flocks of domestic sheep in idaho, montana, and wyoming in the first 6 decades of the 20th century. the current report describes 4 episodes of tularemia in 3 range flocks in wyoming and south dakota in 1997 and 2007 (1 flock was affected twice). flock owners reported that ticks were unusually numerous and commonly present on sheep during outbreaks. tularemia presented as late-term abortions (3 episodes) or listless ...200818599860
use of fenbendazole for long-term control of protostrongylid lungworms in free-ranging rocky mountain bighorn sheep.in an effort to control protostrongylus spp. in a rocky mountain bighorn sheep herd (ovis canadensis canadensis) of approximately 30 animals, fenbendazole-medicated salt was placed on the stillwater bighorn winter range in southcentral montana (usa) for four consecutive winters, 1990 to 1993. sheep of all age and sex classes were observed using the medicated salt throughout the study period. prevalence and average number of lungworm larvae per gram of bighorn feces declined significantly (p < 0. ...19979131579
distribution of potential intermediate hosts for fasciola hepatica and fascioloides magna in montana, usa.a collection of lymnaeid snails in montana was made over a 3 year period, in conjunction with a state-wide survey of the distribution of liver flukes in montana. collection areas were selected based on reports of infected cattle, sheep or wildlife, and with the intent of covering all geographic regions of the state. snails were found at all 97 of the locations chosen for collections, with lymnaeids collected at 71 of the locations. the 97 sites were located in 28 of montana's 56 counties. nine l ...19968638394
ovine abortion and neonatal death due to toxoplasmosis in montana.of 33 ewes in a flock in montana, 6 aborted or gave birth to weak lambs, which died within 2 days after birth. two lambs and a placenta from 1 ewe as well as 1 lamb from another ewe were submitted for diagnosis. focal necrotizing placentitis, focal pneumonia, focal hepatitis, focal interstitial nephritis, and focal nonsuppurative encephalitis were seen in tissue sections from 2 of the lambs. toxoplasma gondii was found in smears and sections of the placenta and in sections of lung from 1 lamb. m ...19846725101
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