Publications

paratuberculosis (johne's disease) in bighorn sheep and a rocky mountain goat in colorado.	between may, 1972 and february, 1978, six cases of paratuberculosis (johne's disease) caused by mycobacterium paratuberculosis were diagnosed in free-ranging rocky mountain bighorn sheep (ovis canadensis) and one rocky mountain goat (oreamnos americanus) on or near mt. evans in colorado. diagnosis of paratuberculosis was based on gross and histopathologic examination of the animals and by isolation of m. paratuberculosis from three sheep and the goat. the clinical signs and pathologic changes se ...	1979	480512
isolation and serologic evidence of a respiratory syncytial virus in bighorn sheep from colorado.		1986	3735590
an epizootic of contagious ecthyma in rocky mountain bighorn sheep in colorado.		1981	7338983
epidemic pasteurellosis in a bighorn sheep population coinciding with the appearance of a domestic sheep.	a pneumonia epidemic reduced bighorn sheep (ovis canadensis) survival and recruitment during 1997-2000 in a population comprised of three interconnected wintering herds (kenosha mountains, sugarloaf mountain, twin eagles) that inhabited the kenosha and tarryall mountain ranges in central colorado, usa. the onset of this epidemic coincided temporally and spatially with the appearance of a single domestic sheep (ovis aires) on the sugarloaf mountain herd's winter range in december 1997. although o ...	2008	18436671
a bighorn sheep die-off in southern colorado involving a pasteurellaceae strain that may have originated from syntopic cattle.	we investigated a pasteurellosis epizootic in free-ranging bighorn sheep (ovis canadensis) wherein a pasteurellaceae strain carried by syntopic cattle (bos taurus) under severe winter conditions appeared to contribute to pneumonia in affected bighorns. twenty-one moribund or dead bighorn sheep were found on the "fossil ridge" herd's winter range, colorado, usa, between 13 december 2007 and 29 february 2008. eight carcasses examined showed gross or microscopic evidence of acute to subacute fibrin ...	2010	20966277
an ecological study of the bighorn sheep in rocky mountain national park, colorado.		1946	21020476
pasteurellaceae from colorado bighorn sheep herds.	we compared phenotypic and genotypic characterizations of 88 pasteurellaceae isolates from bighorn sheep (ovis canadensis) in the course of exploring epizootiologic relationships. based on our observations, adopting contemporary taxonomic conventions and using molecular methods to detect and compare pasteurellaceae may help improve understanding of bighorn respiratory disease epizootiology and management.	2011	21719858
detection probability and pasteurellaceae surveillance in bighorn sheep.	we investigated the influence of detection probability (i.e., the probability of detecting the disease or organism of interest) on the repeatability of results reported from bacterial culture tests used to demonstrate the presence of species in the pasteurellaceae family that infect bighorn sheep (ovis canadensis). we also estimated occupancy probabilities (i.e., the probability an individual bighorn in a herd is infected) for each cultured biovariant and examined the effects of detection probab ...	2012	22740525
phylogenetic and epidemiologic relationships among pasteurellaceae from colorado bighorn sheep herds.	we used 16s rrna sequencing and leukotoxin gene (lkta) screening via pcr assay to clarify phylogenetic and epidemiologic relationships among pasteurellaceae isolated from bighorn sheep (ovis canadensis). only six of 21 bighorn isolates identified as "mannheimia haemolytica" in original laboratory reports appeared to be isolates of m. haemolytica sensu stricto based on 16s rrna sequence comparisons; the remainder grouped with m. glucosida (n=8) or m. ruminalis (n=7). similarly, 16s rrna sequence ...	2013	23778616
how respiratory pathogens contribute to lamb mortality in a poorly performing bighorn sheep ( ovis canadensis ) herd.	we evaluated bighorn sheep ( ovis canadensis ) ewes and their lambs in captivity to examine the sources and roles of respiratory pathogens causing lamb mortality in a poorly performing herd. after seven consecutive years of observed december recruitments of <10%, 13 adult female bighorn sheep from the remnant gribbles park herd in colorado, us were captured and transported to the thorne-williams wildlife research center in wyoming in march 2013. ewes were sampled repeatedly over 16 mo. in april ...	2017	27690193
assessing timing and causes of neonatal lamb losses in a bighorn sheep ovis canadensis canadensis herd via use of vaginal implant transmitters.	we evaluated the use of vaginal implant transmitters (vits) as a means of detecting, capturing, and radio collaring rocky mountain bighorn sheep ( ovis canadensis canadensis) lambs to estimate survival and to facilitate carcass recovery to assess causes of mortality. we focused on one of several bighorn herds in colorado, usa, suffering from depressed recruitment that was not preceded by a classic all-age die-off. we captured, radio-collared, diagnosed pregnancy by ultrasound examination, and in ...	2017	28192042