| experimental infection of some north american wild ruminants and domestic sheep with mycobacterium paratuberculosis: clinical and bacteriological findings. | mycobacterium paratuberculosis originally isolated from bighorn sheep (ovis canadensis) with spontaneous paratuberculosis was used to orally inoculate rocky mountain elk (cervus elaphus nelsoni) calves, mule deer (odocoileus hemionus) fawns, white-tailed deer (odocoileus virginianus) fawns, bighorn x mouflon (ovis musimon) hybrid lambs, and domestic lambs. all experimentally exposed animals became infected. during the first year of infection, hybrid and domestic sheep were able to control the in ... | 1983 | 6644916 |
| psoroptic scabies in desert bighorn sheep (ovis canadensis nelsoni) from northwestern arizona. | scabies due to infestation by psoroptes ovis was monitored from 1979 through 1981 in nelson's desert bighorn sheep in northwestern arizona. visual examinations for ear lesions and evaluations of ear scrapings were used to assess the prevalence of mites in sheep that were live-captured or killed during the hunting season. the prevalence of psoroptic scabies in live-captured sheep for the years 1979, 1980, and 1981, was 25%, 25%, and 0%, respectively, and was higher in rams (1979, 65%; 1980, 100%) ... | 1983 | 6644933 |
| experimental contagious ecthyma in mule deer, white-tailed deer, pronghorn and wapiti. | hand-reared mule deer fawns (odocoileus hemionus), white-tailed deer fawns (odocoileus virginianus), pronghorn fawns (antilocapra americana) and wapiti calves (cervus elaphus nelsoni) were exposed to contagious ecthyma lesion material obtained from rocky mountain bighorn sheep (ovis canadensis canadensis) to determine the susceptibility and pathogenesis in these species. all four species developed mucocutaneous proliferative lesions of the oral cavity, grossly and histologically compatible with ... | 1983 | 6685778 |
| sarcocystis in wild ungulates in alberta. | muscle samples from 557 wild ungulates in alberta, comprising seven species, were examined grossly and/or histologically for cysts of sarcocystis. sarcocystis was found in 100, 96, 94, 75, 75, 73, and 49% of the wapiti (cervus canadensis), moose (alces alces), bison (bison bison), mule deer (odocoileus hemionus), bighorn sheep (ovis canadensis), mountain goat (oreamnos americanus), and white-tailed deer (o. virginianus), respectively. | 1980 | 6780701 |
| the baermann technique for estimating protostrongylus infection in bighorn sheep: effect of laboratory procedures. | the modified baermann funnel technique was evaluated to determine the effects of time of baermannization, fecal preparation, type and size of funnel, and type of filter on the number of first stage larvae of protostrongylus spp. recovered from feces of rocky mountain bighorn sheep (ovis canadensis). more larvae were recovered when fecal pellets were baermannized for 24 hr compared to 8 hr, and when feces were crushed than when left intact. use of small funnels resulted in the recovery of more la ... | 1983 | 6842742 |
| pathology of spontaneous and experimental infection of north american wild ruminants with mycobacterium paratuberculosis. | spontaneous paratuberculosis was studied in free-ranging and captive bighorn sheep (ovis canadensis), and rocky mountain goats (oreamnos americanus). lesions of paratuberculosis in these species resembled the disease in domestic sheep and goats. mycobacterium paratuberculosis cultured from bighorn sheep was used to orally infect bighorn x mouflon (ovis musimon) hybrid sheep, elk (cervus elaphus nelsoni), mule deer (odocoileus hemionus), and white-tailed deer (odocoileus virginianus). clinical pa ... | 1983 | 6879954 |
| anaplasma infections in wild and domestic ruminants: a review. | anaplasma marginale can be transmitted, will grow and can survive in a large number of domestic and wild animals. it is pathogenic in cattle, and usually produces nonapparent or mild infections in other species. anaplasma marginale has been recovered from cattle, sheep, goats, water buffalo (bubalus bubalis), white-tailed deer (odocoileus virginianus), mule deer (odocoileus hemionus hemionus), black-tailed deer (odocoileus hemionus columbianus), pronghorn (antilocapra americana americana), rocky ... | 1984 | 6716555 |
| the occurrence of oestrus ovis l. (diptera: oestridae) in the bighorn sheep from wyoming and montana. | | 1966 | 5942536 |
| fatal pneumonia of bighorn sheep following association with domestic sheep. | during 1979-1980 acute fibrinopurulent bronchopneumonia resulted in high mortality or total loss of herds of bighorn sheep (ovis canadensis) in california and washington. contact with domestic sheep occurred shortly before the onset of disease in each case. circumstantial evidence indicated that the apparently healthy domestic sheep transmitted pathogenic bacteria to the bighorns, resulting in mortality. pasteurella multocida and corynebacterium pyogenes were isolated from pulmonary tissue of de ... | 1982 | 7047767 |
| blood group comparisons between european mouflon sheep and north american desert bighorn sheep. | blood group systems in true sheep (ovis) provide an additional method by which phylogenetic relationships can be measured. of the eight genetic systems of blood groups identified in domestic sheep, all appeared to have their homologue in european mouflons and at least six might have their equivalent in north american desert bighorns. the red cells of the european mouflon, which is believed to be ancestral to domestic sheep, cross-reacted with domestic sheep blood-group typing reagents much more ... | 1982 | 7096977 |
| isolations of aerobic bacteria from wild desert bighorn sheep (ovis canadensis nelsoni and o. c. mexicana) in arizona. | nasal, pharyngeal, cervical and vaginal swab specimens were obtained from 74 desert bighorn sheep for the purpose of investigating the normal aerobic bacterial flora of wild sheep. a total of 281 isolates was obtained and identified by standard microbiologic tests. one hundred seven of these isolates were gram positive and included bacillus sp. (36%), staphylococcus epidermidis (8%), s. aureus (4%), corynebacterium sp. (diphtheroids, 4%), and streptococcus sp. (48%). gram negative isolates total ... | 1983 | 6887449 |
| serologic survey for selected microbial agents in mammals from alberta, 1976. | blood samples were taken from humans and several species of free-ranging wild mammals from five different geographic areas of alberta, canada. sera were tested for antibody to eastern equine encephalitis (eee) virus, western equine encephalitis (wee) virus, st. louis encephalitis (sle) virus, powassan (pow) virus, the snowshoe hare (ssh) strain of the california group (cal) of viruses, northway (nor) virus, klamath (kla) virus, infectious bovine rhinotracheitis (ibr) virus, and two bacteria, bru ... | 1981 | 6273600 |
| 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 ... | 1984 | 6530714 |
| comparative aspects of biochemical polymorphism in the blood of caprinae species and their hybrids. | biochemical variation at 14 blood loci was reviewed, and specific features compared experimentally in sheep ovis aries, mouflon ovis musimon, goat capra hircus, aoudad ammotragus iervia and in 2 stillborn aoudad x goat hybrids. variation at 3 loci was also studied in dall sheep ovis dalli, bighorn sheep ovis canadensis and rocky mountain goat oreamnos americanus. haemoglobin c production in an anaemic hb ab mouflon and in mouflon x sheep hybrids was examined. mouflon differ from domestic sheep i ... | 1980 | 7458003 |
| comparative leukotoxicities of pasteurella haemolytica isolates from domestic sheep and free-ranging bighorn sheep (ovis canadensis). | twenty-eight isolates of pasteurella haemolytica from domestic sheep (n = 14 isolates) and bighorn sheep (n = 14 isolates) were evaluated for leucotoxicity against peripheral blood neutrophils of bighorn sheep by adding bacterial culture supernatants to bighorn sheep neutrophils in vitro. leukotoxic isolates of p. haemolytica, defined as causing > 50% neutrophil death as measured by release of lactate dehydrogenase into culture supernatants, were identified from eight of 14 domestic sheep isolat ... | 1994 | 7760481 |
| susceptibility of phagocytes from elk, deer, bighorn sheep, and domestic sheep to pasteurella haemolytica cytotoxins. | alveolar macrophages and peripheral blood neutrophils from elk (cervus elaphus), bighorn sheep (ovis canadensis canadensis), and domestic sheep were exposed to culture supernatants from pasteurella haemolytica isolated from bighorn sheep and domestic sheep. in a second experiment, peripheral blood neutrophils from mule deer (odocoileus hemionus), elk, and bighorn sheep were exposed to culture supernatants from p. haemolytica isolated from elk, bighorn sheep and domestic sheep. alveolar macrophag ... | 1994 | 7760482 |
| geographic analysis of pathogen exposure in bighorn sheep (ovis canadensis). | antibody responses were examined among 998 bighorn sheep (ovis canadensis) in california (usa) to determine spatial patterns of pathogen exposure. using a shifting frame analysis, a specific geographic region was delineated that contained bighorn sheep with higher (p < 0.05) levels of multiple exposure (antibodies detected against > or = two pathogens), as well as higher prevalence values for eight of ten individual pathogens. this region in southwestern california encompassed all of the peninsu ... | 1994 | 7933271 |
| forensic identification of ungulate species using restriction digests of pcr-amplified mitochondrial dna. | a survey of mitochondrial d-loop variation in 15 species of ungulates was conducted via amplification by the polymerase chain reaction followed by restriction fragment length polymorphism analysis. this survey included moose (alces alces), caribou (rangifer tarandus), mule deer (odocoileus hemionus hemionus), black-tailed deer (o. h. columbianus), white-tailed deer (o. virginianus), waipiti (cervus elaphus), pronghorn antelope (antilocapra americana), bighorn sheep (ovis canadensis), stone's she ... | 1995 | 8522926 |
| fatal pneumonia following inoculation of healthy bighorn sheep with pasteurella haemolytica from healthy domestic sheep. | in a series of three experiments, isolates of pasteurella haemolytica biotype a, serotype 2, ribotype reference wsu-1, from healthy domestic sheep, were inoculated intratracheally into eight bighorn sheep (ovis canadensis canadensis) and seven domestic sheep with doses of bacteria ranging from 5.3 x 10(8) to 8.6 x 10(11) colony forming units. seven of eight inoculated bighorn sheep died from acute pneumonia within 48 hr of inoculation, whereas all seven domestic sheep inoculated with comparable ... | 1994 | 8028096 |
| hematologic, serum chemistry and serologic values of dall's sheep (ovis dalli dalli) in alaska. | in june 1979, 73 dall's sheep were captured near tok, alaska to determine selected hematologic and serum metabolite parameters and to determine the presence of antibodies to selected pathogens. hematology and serum metabolite values were compared with values for domestic sheep and bighorn sheep (ovis canadensis). antibodies were detected against brucella sp. (4%), campylobacter feti (30%), contagious ecthyma virus (23%) and bovine parainfluenza type 3 virus (1%). antibodies were not detected aga ... | 1983 | 6887435 |
| a reliable transport method for isolating pasteurella haemolytica from bighorn sheep. | we compared three transport methods for the recovery of pasteurella haemolytica from pharyngeal swabs collected under field conditions from 42 bighorn sheep (ovis canadensis) in one captive and three free-ranging populations. transport methods included: amies medium with charcoal, transported on ice, and cultured on blood agar within 24 hr; direct plating on blood agar, transported on heating pads, and incubated at 37 c within 8 hr of collection; and phosphate buffered glycerol (pbg), transporte ... | 1994 | 8028114 |
| bacteria isolated from nasal and tonsillar samples of clinically healthy rocky mountain bighorn and domestic sheep. | nasal and tonsillar samples were collected from 14 free-ranging clinically healthy rocky mountain bighorn sheep (ovis canadensis canadensis) and 10 domestic sheep (ovis aries). we identified 194 bacterial isolates, including 101 from bighorn and 93 from domestic sheep. of these isolates, 115 were gram-positive and 79 were gram-negative. staphylococcus species were the most numerous gram-positive organisms and had a higher incidence in samples from domestic than from bighorn sheep. in contrast st ... | 1994 | 8151809 |
| effects of modified cary and blair medium on recovery of nonhemolytic pasteurella haemolytica from rocky mountain bighorn sheep (ovis canadensis canadensis) pharyngeal swabs. | modified cary and blair transport medium (mcb) was evaluated for recovery of pasteurella spp. from pharyngeal swabs of healthy rocky mountain bighorn sheep (ovis canadensis canadensis). in experiment one, three pharyngeal swabs were collected from each of 25 bighorns. pasteurella haemolytica was recovered from 21 of 25 swabs tested almost immediately and from 16 of 25 swabs held in mcb medium at about 22 c for 24 hr before testing (p > 0.10). recovery of p. haemolytica decreased (p < 0.005) to 1 ... | 1994 | 8151818 |
| cultivation and phylogenetic characterization of a newly recognized human pathogenic protozoan. | an intraerythrocytic protozoan (wa1) recently isolated from a patient in washington state was shown to be morphologically identical to babesia microti but biologically and genetically distinct. continuous growth of wa1 was established in stationary erythrocyte cultures. hybridization of a chemiluminescent babesia-specific dna probe to southern blots of restriction enzyme-digested genomic dna showed that wa1 could be distinguished from other babesia species that were antigenically cross-reactive ... | 1994 | 8169390 |
| characterization of an anaplasma ovis isolate from desert bighorn sheep in southern california. | to understand the role of bighorn sheep (ovis canadensis) in the epidemiology of anaplasmosis, we recovered a field isolate from a suspected enzootic area in southern california (usa). whole blood was collected from three desert bighorn sheep (ovis canadensis nelsoni) and inoculated into a susceptible splenectomized domestic sheep, calf and a susceptible spleen-intact bighorn sheep. no infection occurred in the calf, but a detectable infection developed in both the domestic sheep and bighorn she ... | 1993 | 8258851 |
| a retrospective serologic survey for anaplasma spp. infection in three bighorn sheep (ovis canadensis) populations in california. | using an indirect immunofluorescence assay, we determined the prevalence of anaplasma-reactive antibody in three herds of bighorn sheep, each a different subspecies and occupying a different habitat in california (usa). antibodies to anaplasma spp. were identified in none of twenty california bighorn (ovis canadensis californiana) sampled from the mt. baxter herd, 11 of 17 peninsular bighorn (o. canadensis cremnobates) sampled in the santa rosa mountains, and all 20 desert bighorn (o. canadensis ... | 1993 | 8258852 |
| characteristic differences in reverse transcription-polymerase chain reaction products of ovine, bovine, and human respiratory syncytial viruses. | in reverse transcription-polymerase chain reactions (rt-pcr) and dna hybridizations using primers and an oligonucleotide probe to the fusion (f) protein mrna of bovine respiratory syncytial virus (brsv), all the brsv isolates and a goat isolate could be distinguished from prototype isolates of human respiratory syncytial viruses (hrsv) and ovine (sheep and bighorn sheep) respiratory syncytial viruses (rsv). however, rt-pcr amplifications with primers to sequences of the hrsv f protein mrna resul ... | 1993 | 8373845 |
| restriction endonuclease analysis of herpesviruses isolated from two peninsular bighorn sheep (ovis canadensis cremnobates). | in 1989, herpesviruses were isolated from nasal swabs taken from two peninsular bighorn sheep (ovis canadensis cremnobates) in the anza-borrego desert state park, san diego county, california (usa). using restriction endonuclease analysis (rea) with pst1 enzyme, each isolate was found to be similar to the cooper strain of infectious bovine rhinotracheitis virus (ibrv). the rea patterns of the two herpesviruses from bighorn sheep were typical of either field strains or vaccine strains of ibrv com ... | 1993 | 8383254 |
| use of dna analysis of pasteurella haemolytica biotype t isolates to monitor transmission in bighorn sheep (ovis canadensis canadensis). | pneumonia has been identified as a major cause of poor lamb survival in indigenous herds of rocky mountain bighorn sheep (ovis canadensis canadensis) in central idaho. pasteurella haemolytica was isolated from five adult rocky mountain bighorn ewes captured from a free-ranging herd in central idaho. the lambs from two of these ewes delivered by cesarean section were free of p. haemolytica until 40 days of age and after repeated contact with their dams. the lambs subsequently developed signs of p ... | 1993 | 8385150 |
| cranial lesions attributable to chronic sinusitis in bighorn sheep--. | | 1982 | 7174487 |
| reproductive gambling in bighorn sheep (ovis): a simulation. | | 1982 | 7176663 |
| identification and control of psoroptic scabies in bighorn sheep (ovis canadensis mexicana). | | 1980 | 6947292 |
| an epizootic of contagious ecthyma in rocky mountain bighorn sheep in colorado. | | 1981 | 7338983 |
| preliminary evaluation of ivermectin for control of psoroptes ovis in desert bighorn sheep. | | 1983 | 6687742 |
| chronic cranial osteitis in a rocky mountain bighorn sheep. | | 1982 | 7131664 |
| 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 ... | 1993 | 8445795 |
| self-awareness, task failure, and disinhibition: how attentional focus affects eating. | dieting and nondieting subjects were given either failure or neutral performance feedback on a problem-solving task. failure subjects were then assigned to one of three self-awareness conditions: one group was forced to watch a video clip of themselves failing on the problem-solving task, one group was asked to watch a distracting video clip on bighorn sheep, and the final group was asked to sit quietly for 10 minutes. subjects were then allowed to eat as much ice cream as they wanted. only in t ... | 1993 | 8463951 |
| the isolation and partial characterization of a babesia sp. from desert bighorn sheep (ovis canadensis nelsoni). | a novel babesia parasite of desert bighorn sheep was isolated. its taxonomic description, host range, pathogenicity and antigenic relatedness were investigated. the parasite was infective for black-tailed and white-tailed deer, but with host-specific differences compared to that of bighorn sheep. a splenectomized calf and domestic sheep were refractory to infection. a comparative immunofluorescence assay detected antigens cross-reactive with babesia odocoilei, b. divergens, b. equi and b. caball ... | 1993 | 8508161 |
| microsatellite evolution in congeneric mammals: domestic and bighorn sheep. | we compared genotypes at eight (ac)n microsatellite loci in domestic sheep (ovis aries) and wild rocky mountain bighorn sheep (o. canadensis). the domestic sheep had greater genetic variation, higher allele-size variances, and larger allele sizes than the wild sheep. accumulating evidence from higher taxonomic comparisons shows that these parameters are biased if microsatellite loci are selected in one taxon and used in another. our results demonstrate similar biases between congeneric species. ... | 1995 | 8524043 |
| conductive hearing loss in bighorn sheep. | in january 1993 we simulated a conductive hearing loss in three mexican bighorn sheep (ovis canadensis mexicana) by placing bone wax or saline solution in their ear canals. our objective was to test whether lesions of the external auditory canal caused by psoroptic mites (psoroptes ovis) may lead to conductive hearing loss in bighorn sheep. we assessed the effects of these manipulations using the auditory brainstem response test. placing saline solution in the external auditory canal, which load ... | 1995 | 8583641 |
| seroprevalence of two babesia spp. isolates in selected bighorn sheep (ovis canadensis) and mule deer (odocoileus hemionus) populations in california. | sera from 111 bighorn sheep (ovis canadensis) and 95 mule deer (odocoileus hemionus) were tested using an indirect immunofluorescence assay for antibodies to two isolates of babesia spp. recently obtained from these hosts in california (usa). the study populations were from six locations: three areas of real or potential sympatry of bighorn sheep and deer, one area with deer only, and two areas with bighorn sheep only. antibody titers from seroreactive individuals were similar with both babesial ... | 1995 | 8592376 |
| progesterone levels in peripheral plasma of rocky mountain bighorn ewes (ovis canadensis) during the estrous cycle and pregnancy. | | 1980 | 7427804 |
| pregnancy detection in bighorn sheep (ovis canadensis) using a fecal-based enzyme immunoassay. | we developed and validated an enzyme immunoassay for immunoreactive pregnanediol-3-glucuronide (ipdg) in feces to monitor reproductive status in desert and rocky mountain bighorn sheep (ovis canadensis). fecal ipdg concentrations were strongly correlated (r = 0.71) with serum progesterone concentrations in paired fecal and blood samples collected from 34 free-ranging desert bighorn sheep. in bimonthly fecal samples collected from 12 captive ewes, fecal ipdg profiles were similar between desert a ... | 1996 | 8627939 |
| effects of visible signs of contagious ecthyma on mass and survival of bighorn lambs. | external signs of contagious ecthyma became common in a population of rocky mountain bighorn sheep (ovis canadensis) in alberta, canada, after it attained high density. between 1990 and 1993, we studied effects of this disease on mass gain and survival of lambs. prevalence and severity were independent of lamb sex. lambs with large sores and scabs gained less mass than other lambs and were lighter the following spring as yearlings. there was no significant effect of the disease upon lamb surviva ... | 1996 | 8722267 |
| attempted protection of bighorn sheep (ovis canadensis) from pneumonia using a nonlethal cytotoxic strain of pasteurella haemolytica, biotype a, serotype. | between february and april, 1994, we tested the hypothesis that bighorn sheep (ovis canadensis canadensis) inoculated with a cytotoxic isolate of pasteurella haemolytica biotype a, serotype 11 (a11) could withstand challenge inoculation with a cytotoxic strain of p. haemolytica a2 of domestic sheep origin known to cause lethal pneumonia in bighorn sheep. on experimental day o, two bighorn sheep were inoculated intratracheally with 6 x 10(9) colony forming units (cfu) of a cytotoxic strain of p. ... | 1996 | 8722270 |
| prevalence of antibody to malignant catarrhal fever virus in wild and domestic ruminants by competitive-inhibition elisa. | a competitive-inhibition elisa (ci-elisa), based on a monoclonal antibody to an epitope conserved among malignant catarrhal fever virus (mcfv) strains of both wildebeest and sheep origin, was used to determine the prevalence of antibody to mcfv in selected domestic and wild ruminants, both free-ranging and captive, from the usa. we evaluated 2528 sera from 14 species between 1990 and 1995, including 80 pronghorn antelope (antilocapra americana), 339 bighorn sheep (ovis canadensis), 103 biston (b ... | 1996 | 8827669 |
| the use of a tympanic membrane thermometer for assessing hyperthermia in bighorn sheep. | in november 1992, 45 desert bighorn sheep (ovis canadensis nelsoni) were captured at old dad peak and the kelso mountains of southern california (usa) using a netgun fired from a helicopter. tympanic membrane temperature was compared to rectal temperature for 22 sheep to determine if tympanic membrane temperature was a reliable indicator of hyperthermia and capture stress. all animals captured had elevated rectal temperatures after capture and arrival to the processing area. the group of 22 shee ... | 1996 | 8827678 |
| susceptibility of bighorn sheep (ovis canadensis) to experimentally-induced fascioloides magna infections. | three captive rocky mountain bighorn sheep (ovis canadensis canadensis), consisting of a female lamb, a yearling ram, and a 2 1/2-yr-old castrated ram were inoculated orally with 50 (n = 1) or 100 (n = 2) metacercariae of fascioloides magna in november 1991. all three sheep died from fluke infection on post-inoculation days 104, 140, and 197, respectively. numbers of f. magna recovered were 3 (3%), 18 (36%), and 21 (21%). all dukes were immature and were recovered from liver (n = 36), lungs (n = ... | 1996 | 8827689 |
| the distribution of dermacentor hunteri and anaplasma sp. in desert bighorn sheep (ovis canadensis). | the ixodid tick dermacentor hunteri has been collected intermittently this century, primarily from desert bighorn sheep (ovis canadensis). anaplasma spp. are intraerythrocytic rickettsial parasites of ungulates and are vectored in the western united states by ticks of the genus dermacentor. we tested the hypotheses that d. hunteri would be found infesting all populations of desert bighorn, and that all infested populations would be seropositive for anaplasma sp. dermacentor hunteri was found on ... | 1997 | 9057693 |
| survey of chronic sinusitis-induced skull anomalies in desert bighorn sheep. | bone anomalies were found in 20% of 630 skulls from desert bighorn sheep (ovis canadensis) representing populations of california bighorn (o canadensis californiana), lower california bighorn (o canadensis cremnobates), mexican bighorn (o canadensis mexicana), and nelson bighorn (o canadensis nelsoni) that are native to arizona, california, nevada, new mexico, and utah. the anomalies were extremely diverse, ranging from osteonecrosis within the matrix of the paranasal sinuses to extensive lysis ... | 1981 | 7327996 |
| isolation and in vitro cultivation of babesia parasites from free-ranging desert bighorn sheep (ovis canadensis nelsoni) and mule deer (odocoileus hemionus) in california. | protozoal parasites of the genus babesia were isolated for the first time from free-ranging desert bighorn sheep (ovis canadensis nelsoni) and mule deer (odocoileus hemionus) populations in california by in vitro culture of host blood. these naturally infected animals did not have microscopically detectable parasitemia at the time blood was collected for parasite cultivation. three isolates of small babesia parasites were cultured from different sample groups of bighorn sheep, and 2 isolates of ... | 1993 | 8437062 |
| 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. ... | 1997 | 9131579 |
| pathogen exposure patterns among sympatric populations of bighorn sheep, mule deer and cattle. | we sampled sympatric bighorn sheep (ovis canadensis, n = 31), mule deer (odocoileus hemionus, n = 38), and domestic cattle (n = 26) in the san bernadino mountains of southern california (usa) for the presence of psoroptes spp. mites and for serologic evidence of exposure to bluetongue virus (btv) and babesia spp. from 1991 through 1994, psoroptes spp. infestations were found on 12 (44%) of 27 bighorn sheep. no mites were found on mule deer or cattle. the btv serum antibody prevalence in a cohort ... | 1997 | 9131583 |
| psoroptic scabies in bignorn sheep (ovis canadensis mexicana) in new mexico. | prior to 1978, no reports were made of scabies lesions or mites recovered from any mexican bighorn sheep (ovis canadensis mexicana) examined in the san andres national wildlife refuge in southern new mexico. in 1978, all of five rams harvested by hunters had live mites of the genus psoroptes and active lesions of scabies in their ears and/or on their bodies. deaths due to scabies were not documented during this outbreak although aerial helicopter surveys conducted in march, june and september, ... | 1980 | 7373729 |
| genetic variation of major histocompatibility complex and microsatellite loci: a comparison in bighorn sheep. | examining and comparing genetic variation for major histocompatibility complex (mhc) and micro-satellite (ms) loci in the same individuals provides an opportunity to understand the forces influencing genetic variation. we examined five mhc and three ms loci in 235 bighorn sheep (ovis canadensis) from 14 populations and found that both types of loci were highly variable and were in hardy-weinberg proportions. mean fst values for both markers were very similar and mhc and ms genetic variability wa ... | 1997 | 9071595 |
| pasteurella haemolytica cytotoxin-dependent killing of neutrophils from bighorn and domestic sheep. | peripheral blood neutrophils from rocky mountain bighorn sheep (ovis canadensis canadensis) and domestic sheep were exposed to culture supernatants from pasteurella haemolytica isolates recovered from these two sheep species. six culture supernatants from bighorn sheep isolates and two from domestic sheep isolates were tested for cytotoxicity as determined by the release of lactate dehydrogenase. two of the bacterial culture supernatants from bighorn sheep were not cytotoxic, while the other fou ... | 1993 | 8445788 |
| efficacy of in-feed formulation ivermectin against psoroptes sp. in bighorn sheep. | four rocky mountain bighorn sheep (ovis canadensis canadensis) were experimentally inoculated with psoroptes sp. of bighorn sheep origin by placing approximately 50 mites into each ear. two sheep developed reproducing mite colonies and lesions consisting of alopecia, and exudative dermatitis with scabs on ears, face and neck. three months after inoculation, all four sheep were treated with an in-feed formulation of ivermectin at a dosage of 1 mg/kg of body weight in a pelleted ration daily for s ... | 1993 | 8445794 |
| susceptibility of dall sheep (ovis dalli dalli) to pneumonia caused by pasteurella haemolytica. | we evaluated susceptibility of dall sheep (ovis dalli dalli) to bacterial pneumonia induced by two strains of pasteurella haemolytica of domestic sheep origin by evaluating the sensitivity of blood neutrophils of eight dall sheep to lysis by cytotoxins of p. haemolytica, and by intratracheal inoculation of three dall sheep, two bighorn sheep (ovis canadensis), and two domestic sheep with 3.7 x 10(6) or 2.5 x 10(7) colony forming units of p. haemolytica. neutrophils from the dall sheep were more ... | 1996 | 9359056 |
| experimental contact of bighorn sheep (ovis canadensis) with horses and cattle, and comparison of neutrophil sensitivity to pasteurella haemolytica cytotoxins. | peripheral blood neutrophils from horses, cattle, and rocky mountain bighorn sheep (ovis canadensis canadensis) were evaluated for susceptibility to cytotoxin-dependent lysis of different biotypes and serotypes of pasteurella haemolytica of domestic sheep, cattle, bighorn sheep, or mountain goat (oreamnos americana) origin utilizing a cytotoxicity assay which measures the degree of bacteria cytotoxin-killing of neutrophils. all isolates of p. haemolytica (biotypes a and t) were noncytotoxic to h ... | 1996 | 9359057 |
| meningeal worm in experimentally-infected bighorn and domestic sheep. | in the first (july 1989) of two experiments, each of three bighorn sheep (ovis canadensis) and three domestic sheep, respectively, was exposed to 25, 150, or 300 infective third-stage larvae (l3) of the meningeal worm, parelaphostrongylus tenuis. two bighorn sheep had temporary mild paresis and lumbar weakness; one developed paralysis and died suddenly 32 days after exposure. adult p. tenuis were found deep within the brain and spinal cord of the one latter sheep. a generalized inflammatory resp ... | 1996 | 9359060 |
| antibody responses to psoroptes sp. mites in dall sheep (ovis dalli). | we determined that antibody responses to psoroptes sp. mites were not present in 403 of 407 sera samples collected opportunistically from 1979 through 1991 from dall sheep (ovis dalli) from five locations in alaska, usa (eastern arctic, n = 61; central arctic, n = 15; western interior, n = 122; central interior, n = 63; eastern interior, n = 146). test values for four samples exceeded the positive cutoff value for the immunoassay, but exposure to mites could not be confirmed since the 95% confid ... | 1996 | 9359078 |
| evaluation of a multivalent pasteurella haemolytica vaccine in bighorn sheep: safety and serologic responses. | we examined effects of a multivalent pasteurella haemolytica vaccine (serotypes a1, a2, t10) on humoral immune responses and p. haemolytica isolation rates in bighorn sheep (ovis canadensis). thirty captive bighorns, divided into groups of three on the basis of age, sex, and previous history of pneumonic pasteurellosis, received 0, 1, or 2 vaccine doses. mild, transient lameness in most bighorns 1 day after initial vaccination was the only adverse effect observed. oropharyngeal (> or = 75%) and ... | 1997 | 9391957 |
| extracting protostrongylus spp. larvae from bighorn sheep feces. | first-stage larvae of protostrongylus spp. were more numerous in the core of bighorn sheep (ovis canadiensis canadiensis) pellets than near the surface. as a result, only 22% could be extracted from whole pellets and the numbers collected did not reflect the total number of larvae present in samples. crushing semi-dried pellets yielded seven times as many larvae and numbers collected were correlated with totals present. the use of tissue, in addition to a screen filter in a beaker extraction met ... | 1997 | 9391973 |
| a fatal case of babesiosis in missouri: identification of another piroplasm that infects humans. | to characterize the etiologic agents (mo1) of the first reported case of babesiosis acquired in missouri. | 1996 | 8607592 |
| evaluation of a multivalent pasteurella haemolytica vaccine in bighorn sheep: protection from experimental challenge. | the efficacy of a multivalent pasteurella haemolytica vaccine (a1, a2, t10) in reducing morbidity and mortality associated with pneumonic pasteurellosis in bighorn sheep (ovis canadensis) was examined. fifteen captive bighorns were divided equally into three treatment groups based on vaccination status: control (no vaccination), one dose 10 days prior to challenge, or one or two doses 57 wk prior to challenge. at challenge, each bighorn received about 6.2 x 10(7) colony forming units of p. haemo ... | 1998 | 9577780 |
| immobilization of mountain goats with xylazine and reversal with idazoxan. | mountain goats (oreamnos americanus) were captured in traps and immobilized with xylazine, later reversed with idazoxan. one hundred and forty-one goats were immobilized, 94 with a single injection and 47 with multiple injections. dosage (mg/kg of body weight) of xylazine received, induction time, and recovery time after handling did not differ among sex-age classes. increasing the dosage did not shorten induction time. the first injection of xylazine in multiple-injection captures was lower tha ... | 1998 | 9577782 |
| evaluation of bluetongue virus diagnostic tests in free-ranging bighorn sheep. | five bluetongue virus (btv) diagnostic tests were evaluated for use in free-ranging bighorn sheep. we sampled one bighorn sheep population four times between 1989 and 1995. the tests evaluated included virus isolation (vi), polymerase-chain reaction (pcr), serum neutralization (sn), agar-gel immunodiffusion (agid), and competitive enzyme-linked immunosorbent assay (c-elisa). the c-elisa, agid and sn tests had high levels of agreement in determining serogroup exposure in bighorn sheep. we used ma ... | 1998 | 9689659 |
| surgical implantation and evaluation of heart rate transmitters in captive bighorn sheep. | a surgical approach was developed for implantation of transmitters to monitor heart rate of bighorn sheep (ovis canadensis) with an objective of discrete long-term, long-range data collection. we surgically implanted telonics model hr400 transmitters on the dorsolateral thorax of 15 captive adult bighorn sheep ewes in april-may and october-november 1995. no complications or marked impairment of function were associated with the surgery; however, a transmitter was passively expelled from one ewe ... | 1998 | 9706564 |
| foraging behaviour and sexual segregation in bighorn sheep. | like many sexually dimorphic ungulates, bighorn sheep, ovis canadensis, form sexually segregated groups. nursery groups include females, lambs and subadult males, while adult males form bachelor groups. previous hypotheses to account for sexual segregation in ungulates have suggested sexual differences in energy requirements, predation risk and social preferences. i tested the hypothesis that differing nutritional demands, due to sexual dimorphism in body size, would lead to different movement p ... | 1998 | 9710466 |
| usefulness of molecular markers for detecting population bottlenecks via monitoring genetic change. | it is important to detect population bottlenecks in threatened and managed species because bottlenecks can increase the risk of population extinction. early detection is critical and can be facilitated by statistically powerful monitoring programs for detecting bottleneck-induced genetic change. we used monte carlo computer simulations to evaluate the power of the following tests for detecting genetic changes caused by a severe reduction in a population's effective size (ne): a test for loss of ... | 1998 | 9711862 |
| a diet supplement for captive wild ruminants. | nutritional husbandry of captive wild ruminants often requires feeding these animals a supplemental diet to enhance their health, reproductive performance, and productivity. although supplemental diets for wild ruminants are commercially available, few have been evaluated in controlled intake and digestion trials. voluntary intake, digestive efficiency, nitrogen retention, and gross energy utilization of pronghorn (antilocapra americana), mule deer (odocoileus hemionus), mountain sheep (ovis can ... | 1998 | 9732028 |
| dermacentor hunteri (acari: ixodidae): seasonal variation in questing adults and on-host juvenile stages, and host associations and feeding behavior of larvae and nymphs. | dermacentor hunteri bishopp is the only completely desert adapted tick in the nearctic realm, and chiefly parasitizes desert bighorn sheep (ovis canadensis shaw) as an adult. the remainder of its life history has been unknown. we conducted field investigations in the sonoran desert of the temporal and spatial variation of adult host-seeking ticks and of the host associations of juvenile ticks. additionally, the feeding success of juvenile ticks was assessed in the laboratory. adult ticks were fo ... | 1998 | 9835699 |
| population subdivision among desert bighorn sheep (ovis canadensis) ewes revealed by mitochondrial dna analysis. | we used behavioural observations and mitochondrial dna (mtdna) sequence analysis to examine demographic and genetic structure within and among home-range groups of desert bighorn sheep (ovis canadensis) ewes in the peninsular ranges of southern california, usa. we identified substantial genetic variation in the first 515 bp of the mtdna control region and determined that seven haplotypes were distributed in a nonrandom fashion among these ewe subpopulations. although a significant (p < 0.01) amo ... | 1999 | 9919700 |
| immunologic responses of domestic and bighorn sheep to a multivalent pasteurella haemolytica vaccine. | the efficacy of a pasteurella haemolytica vaccine (serotypes a1, a2, and t10) to induce humoral antibodies and alter colonization of the upper respiratory tract by related p. haemolytica spp. strains was evaluated in 10 bighorn (ovis canadensis canadensis) and 10 domestic (ovis aries) sheep. sheep of each species were divided into five pairs based on age and history of respiratory disease. one sheep in each pair was vaccinated twice 2 wk apart with 2 ml of vaccine (vac group) and the remaining a ... | 1999 | 10231755 |
| biovariants of isolates of pasteurella from domestic and wild ruminants. | a total of 608 bacterial isolates previously identified as pasteurella haemolytica biotypes a and 3, p. trehalosi, and p. multocida, were separated into 73 distinct biovariants using 21 phenotypic characteristics. the largest group (54%) of wildlife isolates was identified as biogroup 2 and biogroup 2 variants. biogroup 2 and biogroup 2 variants accounted for only 17% of isolates from domestic ruminants and were all from sheep. in contrast, 43% of isolates from domestic ruminants were identified ... | 1998 | 9526860 |
| dermacentor hunteri (acari: ixodidae): an experimental vector of anaplasma marginale and a. ovis (rickettsiales: anaplasmataceae) to calves and sheep. | the experimental vector competence of laboratory-reared dermacentor hunteri bishopp for anaplasma marginale theiler and anaplasma ovis lestoquard was evaluated by delayed transfer of male ticks from infected to susceptible holstein calves and from infected to susceptible domestic sheep, respectively. after feeding for 4 or 5 d on rickettsemic acquisition hosts, the ticks were held off the host at 26 degrees c, approximately 93% rh, and a photoperiod of 14:10 (l:d) h for 7 or 8 d, then test fed f ... | 1999 | 10337102 |
| elaeophorosis in bighorn sheep in new mexico. | two bighorn sheep (ovis canadensis) in new mexico (usa) were found to be naturally infected with elaeophora schneideri. an adult ram examined in 1997 in the fra cristobal mountains had 26 nematodes in the carotid and iliac arteries, and microfilariae were present in the skin, nasal mucosa, brain, and lungs. this ram was markedly debilitated prior to euthanasia and extensive crusty, scabby lesions were observed on its head. in 1998, a yearling ewe found dead adjacent to watson mountain near the g ... | 1999 | 10574542 |
| pasteurella spp. in sympatric bighorn and domestic sheep. | domestic sheep were sighted at different times from 1991 to 1993 on four nevada (usa) ranges occupied by bighorn sheep. nasal and pharyngeal swab samples were collected from both sheep species and cultured to determine if any strains of pasteurella spp. were shared on range conditions after contact of the two species. pasteurella spp. were isolated from all 38 bighorn sheep and 16 of 17 domestic sheep included in this study. the isolates were characterized on the bases of species, biotype, serot ... | 1997 | 9249701 |
| effect of simulated stress on susceptibility of bighorn sheep neutrophils to pasteurella haemolytica leukotoxin. | we examined the effects of simulated stress on susceptibility of rocky mountain bighorn sheep (ovis canadensis canadensis) neutrophils to pasteurella haemolytica leukotoxin in a blocked, crossover experiment. ten captive-raised bighorn sheep were sampled 10 hr after separate administrations of long-acting adrenocorticotrophic hormone (acth) gel and normal saline (control). we then compared in vitro leukotoxin-dependent neutrophil death rates after exposure to culture supernatants from four uniqu ... | 1997 | 9249702 |
| contact transmission of psoroptic mange from bighorn to stone sheep. | psoroptes sp. mites and tan crusty lesions were detected in the ears of a captive stone sheep (ovis dalli stonei) in april 1996, after contact with infected captive rocky mountain bighorn sheep (ovis canadensis canadensis). psoroptes spp. have not been detected in free-ranging ungulates in canada or alaska (usa). this is the first report of psoroptes sp. in stone sheep, indicating their susceptibility to infection. | 1997 | 9249721 |
| desert bighorn sheep mortality due to presumptive type c botulism in california. | during a routine telemetry flight of the mojave desert (california, usa) in august 1995, mortality signals were detected from two of 12 radio-collared female desert bighorn sheep (ovis canadensis) in the vicinity of old dad peak in san bernardino county (california). a series of field investigations determined that at least 45 bighorn sheep had died near two artificial water catchments (guzzlers), including 13 bighorn sheep which had presumably drowned in a guzzler tank. samples from water conta ... | 2000 | 10682765 |
| body mass and individual fitness in female ungulates: bigger is not always better. | in female vertebrates, differences in fitness often correspond to differences in phenotypic quality, suggesting that larger females have greater fitness. variation in individual fitness can result from variation in life span and/or variation in yearly reproductive success, but no study has yet assessed the relationships between the components of fitness and phenotypic quality while controlling for life span. we tried to fill this gap using data from long-term monitoring (23 years) of marked roe ... | 2000 | 10737404 |
| biochemical and hematologic reference intervals for free-ranging desert bighorn sheep. | over 200 clinically normal desert bighorn sheep (ovis canadensis) from multiple geographic areas were sampled utilizing a uniform protocol. the goals of this study were to develop comprehensive reference intervals for hematologic and biochemical analytes using central 90th percentile nonparametric analyses. adult female sheep had greater erythrocyte mass (hemoglobin and hematocrit) compared with adult male sheep. young animals < or = 1-yr-old had greater erythrocyte mass (hemoglobin, hematocrit ... | 2000 | 10813611 |
| susceptibility of two bighorn sheep cell cultures to selected common ruminant viruses. | | 2000 | 10826841 |
| seroprevalence of toxoplasma gondii in rocky mountain bighorn sheep (ovis canadensis). | serum samples from 697 rocky mountain bighorn sheep (ovis canadensis) from north america were examined for antibodies to toxoplasma gondii by the modified agglutination test incorporating mercaptoethanol and formalin-fixed tachyzoites. antibodies to t. gondii were found in 25 of 697 (3.6%) sheep in titers of 1:25 (8 sheep), 1:50 (4 sheep), 1:100 (7 sheep), 1:200 (1 sheep), 1:400 (1 sheep), 1:800 (1 sheep), and 1:1,600 (3 sheep). this is the first record of t. gondii exposure in bighorn sheep. | 2000 | 10864265 |
| consistency of temperament in bighorn ewes and correlates with behaviour and life history. | individual differences in temperament may affect how animals react to novel situations, avoid predation, invest in reproduction and behave in a variety of social contexts. little information is available, however, about individual differences in temperament for wild animals. for bighorn sheep, ovis canadensis, ewes captured as part of a long-term study, we compared behaviour during handling to behaviour in the field and reproductive history. we considered 'bold' ewes those that were frequently t ... | 2000 | 11082229 |
| toxoplasmic encephalitis in a free-ranging rocky mountain bighorn sheep from washington. | a 4-mo-old free-ranging rocky mountain bighorn sheep (ovis canadensis canadensis) from the hells canyon area (washington, usa) was diagnosed with encephalitis associated with toxoplasma gondii infection. the sheep had concurrent pneumonic pasteurellosis and resided in a geographic area with endemic pasteurella-associated pneumonia and mortality in bighorn sheep. the brain had multifocal necrotizing and nonsuppurative encephalitis with intralesional protozoa. the protozoa were identified as t. go ... | 2000 | 11085438 |
| quantitative genetics of life-history traits in a long-lived wild mammal. | quantitative genetic studies of life-history traits in wild populations are very rare, yet variance/covariance estimates of these traits are crucial to understanding the evolution of reproductive strategies. we estimated heritabilities (h2) of several life-history traits (longevity, age and mass at primiparity, and reproductive traits) in two bighorn sheep (ovis canadensis) populations, and both phenotypic (rp) and genetic (ra) correlations between life-history traits in one population. we inclu ... | 2000 | 11240626 |
| incursion of epizootic hemorrhagic disease into the okanagan valley, british columbia in 1999. | in september 1999, unusually high mortality rates in white-tailed deer and california bighorn sheep occurred in the southern okanagan valley. necropsy and histopathologic findings were compatible with epizootic hemorrhagic disease (ehd); the presence of virus was not demonstrated. subsequent serologic and polymerase chain reaction assays on sentinel cattle suggested an ehd virus incursion. | 2001 | 11265190 |
| a molecular analysis of dietary diversity for three archaic native americans. | dna was extracted from three fecal samples, more than 2,000 years old, from hinds cave, texas. amplification of human mtdna sequences showed their affiliation with contemporary native americans, while sequences from pronghorn antelope, bighorn sheep, and cottontail rabbit allowed these animals to be identified as part of the diet of these individuals. furthermore, amplification of chloroplast dna sequences identified eight different plants as dietary elements. these archaic humans consumed 2-4 d ... | 2001 | 11296282 |
| founder effect in an island population of bighorn sheep. | the tiburon island population of desert bighorn sheep has increased in size from 20 founders in 1975 to approximately 650 in 1999. this population is now the only population being used as the source stock for transplantations throughout northern mexico. to evaluate the genetic variation in this population, we examined 10 microsatellite loci and a major histocompatibility complex (mhc) locus. the genetic variation was significantly less than found in other populations of the same subspecies in ar ... | 2001 | 11348494 |
| transmission of psoroptic mites from bighorn sheep (ovis canadensis mexicana) to domestic sheep, cattle and rabbits. | | 1981 | 7198154 |
| is the decline of desert bighorn sheep from infectious disease the result of low mhc variation? | bighorn sheep populations have greatly declined in numbers and distribution since european settlement, primarily because of high susceptibility to infectious diseases transmitted to them from domestic livestock. it has been suggested that low variation at major histocompatibility complex (mhc) genes, the most important genetic aspect of the vertebrate immune system, may result in high susceptibility to infectious disease. therefore, we examined genetic polymorphism at a mhc gene (ovca-drb) in a ... | 2001 | 11520344 |
| new host and geographic records for two protostrongylids in dall's sheep. | biodiversity survey and inventory have resulted in new information on the distribution of protostrongylidae in dall's sheep (ovis dalli dalli) from the northwest territories (nt, canada) and from alaska (ak, usa). in 1998, parelaphostrongylus odocoilei adults were found for the first time in the skeletal muscles of dall's sheep in the mackenzie mountains (nt). adult p. odocoilei were associated with petechial and ecchymotic hemorrhages and localized myositis; eggs and larvae in the lungs were as ... | 2001 | 11763740 |
| age-dependent sexual selection in bighorn rams. | although mating systems and sexual selection have been intensively studied in ungulate model systems, very few studies have combined genetic paternity analysis with individual phenotypic data over several breeding seasons. we used microsatellite paternity analysis to determine the parentage of 83 bighorn sheep (ovis canadensis) born between 1995 and 2000 at ram mountain, alberta, canada. we could assign the paternity of 64 lambs at a high level of statistical confidence (95%). within each season ... | 2002 | 11798432 |
| hemorrhagic disease in bighorn sheep in arizona. | two bighorn sheep from arizona (usa) were submitted for necropsy. one was a rocky mountain bighorn (ovis canadensis canadensis) and the other was a desert bighorn (ovis canadensis mexicana). both had lesions consistent with those of hemorrhagic disease (hd). epizootic hemorrhagic disease virus (ehdv) type-2 and bluetongue virus (btv) type-17, respectively, were isolated from the sheep tissues. to our knowledge, hd caused by either ehdv or btv infection has not been documented previously in arizo ... | 2002 | 11838210 |
| sexual segregation in ungulates: a comparative test of three hypotheses. | in most social ungulate species, males are larger than females and the sexes live in separate groups outside the breeding season. it is important for our understanding of the evolution of sociality to find out why sexual segregation is so widespread not only in ungulates but also in other mammals. sexual body size dimorphism was proposed as a central factor in the evolution of sexual segregation in ungulates. we tested three hypotheses put forward to explain sexual segregation: the predation-ris ... | 2002 | 11911375 |
| safety of brucella abortus strain rb51 vaccine in non-target ungulates and coyotes. | brucellosis is endemic in free-ranging elk (cervus elaphus) and bison (bison bison) in the greater yellowstone area (gya; usa). it is possible that an oral brucellosis vaccine could be developed and disseminated in the gya to reduce disease transmission. should this occur, non-target species other than elk and bison may come in contact with the vaccine resulting in morbidity or mortality. to assess biosafety, bighorn sheep (ovis canadensis; n = 10), pronghorn (antilocapra americana; n = 9), mule ... | 2002 | 12238372 |
| novel protease produced by a pasteurella trehalosi serotype 10 isolate from a pneumonic bighorn sheep: characteristics and potential relevance to protection. | a strain of pasteurella trehalosi serotype 10, e(co)-100, isolated from a bighorn sheep that had succumbed to pneumonic pasteurellosis during an epizootic, was compared to well-characterized strains of p. trehalosi serotype 10 and mannheimia haemolytica serotype 1. the gene for leukotoxin a (lkta) from e(co)-100 was sequenced and found to be identical on an amino acid basis to a published sequence for lkta from p. trehalosi serotype 10. however, the toxic activity in culture supernatant measured ... | 2003 | 12637002 |
| heritability of body mass varies with age and season in wild bighorn sheep | heritabilities (h2) of body mass at different ages and seasons were estimated using offspring-mother regression and restricted maximum likelihood (reml) methods for bighorn sheep on ram mountain, alberta. both methods resulted in similar estimates of h2 for adults, but for lambs and yearlings heritability was underestimated by offspring-mother regression relative to reml, possibly because of higher maternal-effects bias for offspring-mother regression. heritabilities of body mass in bighorn were ... | 1999 | 10620024 |