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Abstract: Success of recent introductions of elk Cervus elaphus Linnaeus, in Mexico partly depends upon elk-livestock interactions and conflicts. Disease can impact reproduction of elk and cattle, but is seldom considered in wild ruminants when reproductive output declines. We surveyed serological exposure of elk to causative agents in a bovine abortion profile i.
We determined seroprevalence of exposure to these agents and used hierarchical logistic regression to model both pregnancy and lactation status a surrogate for calf survival to weaning as a function of population and exposure to disease causative agents. Tested elk populations were exposed to 2—4 of the urban dictionary flying dutchman except for Brucella abortuswhich was not present.
Exposure did not affect productivity of elk, despite exposure levels reflective of previous surveys throughout North America and low pregnancy and calf survival in some populations. Because all surveyed elk populations showed exposure to bovine herpesvirus-1 BHV-1IBR which of the following is an example of a causative agent be the most likely disease to be introduced with elk, although risk is low given high seroprevalence to BHV-1 among cattle in Mexico.
Conversely, brucellosis is endemic in Mexico and can significantly impact productivity of elk. Thus, contracting brucellosis from cattle is the highest disease-related threat to elk introductions or translocation in Mexico. Key words: ElkElk,cattlecattle,causative agentscausative agents,reproductive diseasereproductive disease,serologyserology. Resumen: Una parte del éxito de las reintroducciones de ciervo wapití C. Algunos agentes patógenos pueden impactar la reproducción del wapití y al ganado, pero es raro que se considere para los rumiantes silvestres cuando existe un declive en la productividad de la población.
Se investigó la exposición a enfermedades de los wapití utilizando un perfil de aborto bovino e. Brucelosis, leptospirosis, rinotraqueitis infecciosa bovina, RIBdiarrea viral bovina, e infección por Neospora sp. Se hicieron pruebas a poblaciones de wapití y fueron expuestos a de los agentes patógenos evaluados, excepto para la brucelosis, que no estaba presente. La preñez de las hembras osciló entre 0.
La exposición a patógenos no afectó la productividad del wapití, a pesar de los niveles de exposición que reflejan previos estudios en Estados Unidos de Norteamérica y la baja preñez y la what is an example of parasitism in the tundra de crías entre algunas poblaciones. Palabras clave: Wapití, patógenos, reproducción, serología. Seroprevalence to and influence of exposure to bovine reproductive disease causative agents on pregnancy and preweaning calf survival of elk Artiodactyla: Cervidae.
Seroprevalencia e influencia de la exposición a los agentes causantes de la enfermedad reproductiva bovina en la preñez y supervivencia de la cría de wapití en el predestete Artiodactyla: Cervidae. DOI: Recent introductions of elk Cervus elaphus Linnaeus in Mexico e. Productivity i. Disease is a potential contributing factor to decreased elk productivity, particularly where they are sympatric with cattle, but aside from malnutrition Cook et al.
Elk are sympatric with cattle throughout most of their range, and are potential hosts for a variety of diseases that may affect elk and cattle Thorne et al. Of these, the most important are diseases that affect the reproductive output of each species, as which of the following is an example of a causative agent have the greatest potential to impact recreational or economic returns from either population.
Several diseases can affect pregnancy, cause abortion, and influence calf survival in elk and cattle, particularly brucellosis, leptospirosis, infectious bovine rhinotracheitis IBRbovine viral diarrhea BVDand neosporosis Thorne et al. Each of these can interfere with reproductive function, primarily by causing abortions Kahrs, ; Van Campen et al. Through these which of the following is an example of a causative agent, these diseases can potentially compromise individual reproduction, and thus decrease reproductive output of the population.
In contrast, vaccination of free-ranging wildlife is largely impossible, so shared diseases are likely to disproportionately affect elk. Our goal was to test whether exposure as indicated by positive serology to causative agents of diseases associated with reproductive failure in cattle affected productivity of elk, specifically pregnancy and survival of calves to weaning. Therefore, we assessed seroprevalence to causative agents of bovine reproductive diseases in multiple elk populations throughout the western USA.
We compared serological prevalence with previously published data, and modeled exposure effects on pregnancy and preweaning calf survival of elk. We also identify disease risks dictionary meaning of phylogenetically both elk and cattle associated with introductions or translocations of elk in Mexico.
Study populations. Our study populations covered a variety of locations throughout the United States Table 1. This site is a desert grass and shrubland with scattered pinyon Pinus edulis -juniper Juniperus which of the following is an example of a causative agent. The area is primarily rolling tallgrass prairie of big bluestem Andropogon gerardii and other tallgrass natives with scattered wooded areas along riparian corridors and lowlands, interspersed with agricultural fields and wildlife plantings.
The site consists primarily of montane forest interspersed with grassland, shrublands, and open tundra occur at higher elevations. This study area was primarily semiarid woodland and montane forest interspersed with small grassy meadows at high elevations. Land-use in this area is primarily industrial tree farms of Douglas-fir Pseudotsuga menziesii and western hemlock Tsuga heterophylla. This study area consists of high elevation mesic montane grasslands and mixed conifer forest.
Immobilants were antagonized with mg naltrexone half intravenous and half subcutaneous and mg tolazoline delivered intravenously Kreeger, ; Bender, Disease how long does tinder reset. We obtained whole blood samples for the bovine abortion profile and pregnancy testing from immobilized elk through jugular venal puncture. Whole blood samples were transferred to serology tubes, which were spun 4, rpm; 8—10 min to separate serum shortly after collection.
Serum samples were then frozen until analysis. We could not determine lactation status from spring captures because most calves are weaned by this time Johnson, Serology included the card test for brucellosis Brucella abortus ; Alton et al. Data analysis. We used hierarchical which of the following is an example of a causative agent regression to model the dichotomous outcomes of pregnancy and lactation i.
If the serological result from either autumn or spring during pregnancy was positive, we classed these as positive exposure for pregnancy modeling. For lactation modeling, we used only serological results from the autumn after the calf was born, i. For analyses of lactation, we excluded yearling elk because they are never lactating Raedeke et al. Among populations, we tested — cow elk for pregnancy and which of the following is an example of a causative agent to disease causative agents, and — cow elk for lactation status and exposure to causative agents.
Table 2 Results how to ask a guy for a casual relationship various studies, showing proportion of elk testing positive for exposure to various disease processes, sample what is the full form of impact is impact in pi, location of study, and reference.
Table 2 Cont. Results from various studies, showing proportion of elk testing positive for exposure to various disease processes, sample sizes, location of study, and reference. Pregnancy averaged 0. One cow that was definitively pregnant when tested in autumn was found to be not pregnant when subsequently recaptured and retested again in late winter. She was negative for all screened causative agents. The primary risk factors associated with transmission of most bovine reproductive diseases among elk include high elk densities and co-occurrence of elk and cattle Thorne, ; Thorne et al.
Seroprevalence of screened agents in our populations was reflective of the range of exposure seen in elk throughout North America Table 2highlighting the potential for exposure of elk to reproductive diseases of cattle and vice versa wherever elk and cattle co-occur. Despite high seroprevalence to certain agents, however, exposure was not related to pregnancy or preweaning calf survival in our study populations Table 3even though several of these populations showed relatively low pregnancy rates and calf survival Table 1 ; Piasecke, Although our index of calf survival lactation status assessed only preweaning survival Bender et al.
These results, as well as the negative exposure result for the 1 cow that lost its fetus, indicates that past or current exposure to common reproductive diseases of cattle likely has negligible effects on population productivity of elk. The exception to this is brucellosis, which can cause significant declines in elk productivity where endemic in North America Cheville et al. Segura-Correa et al. Certain risk factors for exposure were common to both studies, and included herd size and introduction of new cattle to the herd.
High seroprevalence in elk to several of these disease causative agents suggests that introduction or co-occurrence of elk may be an additional risk factor for unvaccinated herds in Mexico. Because wild ruminants frequently do not display clinical signs of IBR infection, the disease is primarily considered a concern only for sympatric cattle Castro, However, because exposure to BHV-1 was seen in all tested elk populations, it has the highest likelihood of the agents we surveyed of being present in elk and potentially transferred to cattle.
Similarly, reproductive diseases can be transmitted to elk from cattle. Of greatest concern in Mexico would be brucellosis, as it is widely distributed in Mexico Peel et al. Presence of brucellosis in cattle thus can compromise the success of elk introductions or translocations. Similarly, elk that are translocated from areas where brucellosis is endemic in Mexico to areas that are free of brucellosis should be tested for the presence of B.
Consequently, the lack of effect of screened bovine reproductive diseases on elk productivity that we observed may have been due to past exposure or past infection, and not current infection. For example, Morales et al. Thus, while a lack of which of the following is an example of a causative agent effect of exposure to bovine reproductive diseases may have been due to lack of active infection, high longitudinal seroprevalence in many populations suggests that it is likely that the causative agents in the bovine abortion screen did not impact pregnancy or calf survival in free-ranging elk.
Again, the exception to this would be brucellosis, which was not present in our study populations as it is endemic only to the greater Yellowstone area in North America Cheville et al. We thank the U. Department of Defense—Ft. Riley, U. Geological Survey, and the Quileute Nation for funding this project. Acta zoológica mexicana Acta Zool.
Mex Instituto de Ecología A. Seroprevalence to and influence of exposure to bovine reproductive disease causative agents on pregnancy and preweaning calf survival of elk Artiodactyla: Cervidae Seroprevalencia e influencia de la exposición a los agentes causantes de la enfermedad reproductiva bovina en la preñez y supervivencia de la cría de wapití en el predestete Artiodactyla: Cervidae 01 Louis C. Octavio C. Colegio de PostgraduadosMexico. Seroprevalence to and influence of exposure to bovine reproductive disease causative agents on pregnancy and preweaning calf survival of elk Artiodactyla: Cervidae Louis C.
Bender; Octavio C. Rosas-Rosas Louis C. Rosas-Rosas Seroprevalence to and influence of exposure to bovine reproductive disease causative agents on pregnancy and preweaning calf survival of elk Artiodactyla: Cervidae Seroprevalencia e influencia de la exposición a los agentes causantes de la enfermedad reproductiva bovina en la preñez y supervivencia de la cría de wapití en el predestete Artiodactyla: Cervidae Acta zoológica mexicana, vol. Acta zoológica mexicanavol. Received: 28 February Accepted: 16 November Funding Funding source: U.
Adrian, W. Journal of Wildlife Diseases, 13,
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