Tonie Rocke
Tonie Rocke is a Research Epidemiologist at the National Wildlife Health Center.
Science and Products
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Seasonal prevalence of Clostridium botulinum type C in the sediments of the northern California wetland
The prevalence of Clostridium botulinum type C (% of positive sediment samples) was determined in 10 marshes at Sacramento National Wildlife Refuge (SNWR), located in the Central Valley of California (USA), where avian botulism epizootics occur regularly. Fifty-two percent of 2,200 sediment samples collected over an 18-mo period contained C. botulinum type C (both neurotoxic and aneurotoxic) which
Authors
Renee J. Sandler, T.E. Rocke, M. D. Samuel, Thomas M. Yuill
The role of avian carcasses in botulism epizootics
No abstract available.
Authors
T.M. Reed, T.E. Rocke
Brain acetycholinesterase activity in botulism-intoxicated mallards
Brain acetylcholinesterase (AChE) activity in captive-reared mallards (Anas platyrhynchos) that died of botulism was compared with euthanized controls. AChE levels for both groups were within the range reported for normal mallards, and there was no significant difference in mean AChE activity between birds that ingested botulism toxin and died and those that did not.
Authors
T.E. Rocke, M. D. Samuel
Effects of lead shot ingestion on selected cells of the mallard immune system
The immunologic effects of lead were measured in game-farm mallards (Anas platyrhynchos) that ingested lead shot while foraging naturally, mallards intubated with lead shot, and unexposed controls. Circulating white blood cells (WBC) declined significantly in male mallards exposed to lead by either natural ingestion or intubation, but not females. Spleen plaque-forming cell (SPFC) counts were sign
Authors
T.E. Rocke, M. D. Samuel
Blood lead concentrations in mallards from Delevan and Colusa National Wildlife Refuges
Blood samples were taken from 181 (108 adult drakes and 73 individuals of mixed age and sex) mallards, Anas platyrhynchos, from Colusa and Delevan National Wildlife Refuges during late winter and summer of 1987. The percentage of birds with elevated lead concentration was 28.7 for late winter and 16.4 for late summer. For summer trapped birds, a significantly greater proportion of males than femal
Authors
David M. Mauser, Tonie E. Rocke, John G. Mensik, Christopher J. Brand
Experimental Mycoplasma gallisepticum infections in captive-reared wild turkeys
The effects of Mycoplasma gallisepticum (MG) infections on egg production, fertility, and hatchability were studied in captive-reared wild turkeys (Meleagris gallopavo). Three groups of adult birds, each consisting of four hens and two toms, were exposed to MG by the respiratory route at the beginning of their breeding season. Fourteen control birds received sterile growth medium. Although no mort
Authors
Tonie E. Rocke, Thomas M. Yuill, Terry E. Amundson
Serologic response of Rio Grande wild turkeys to experimental infections of Mycoplasma gallisepticum
The serologic response of Rio Grande wild turkeys (Meleagris gallopavo intermedia) to Mycoplasma gallisepticum (MG) was determined. Free-ranging turkeys were caught in southern Texas, shipped to the University of Wisconsin, Madison, and housed in isolation facilities. Fourteen birds were exposed to MG, by intratracheal and intranasal inoculation. Eight birds received sterile broth only. Two wk pri
Authors
Tonie E. Rocke, Thomas M. Yuill
Hematozoan parasites of Rio Grande wild turkeys from southern Texas (USA)
One hundred twenty-three of 300 blood samples (41%) taken from Rio Grande wild turkeys (Meleagris gallopavo intermedia) from three locations in southern Texas (Welder Wildlife Refuge, Chaparrosa Ranch, and Campo Alegre Ranch) and subinoculated into domestic broad-breasted white turkey poults were positive for a Plasmodium (Novyella) sp. Analysis of blood films from 350 turkeys revealed Haemoproteu
Authors
Marc D. Castle, Beth A. Christensen, Tonie E. Rocke
Microbial infections in a declining wild turkey population in Texas
A survey was conducted at 5 locations in Texas for avian pathogens that might adversely affect wild turkey (Meleagris gallopavo) productivity and survival. At 1 site, the Rob and Bessie Welder Wildlife Refuge (WWR), turkeys have declined precipitously in recent years. During the winters of 1983-85, 442 wild turkeys were caught with cannon and drop nets, 161 of these on WWR. Blood samples were draw
Authors
T.E. Rocke, Thomas M. Yuill
Science and Products
Filter Total Items: 14
No Result Found
Filter Total Items: 130
Seasonal prevalence of Clostridium botulinum type C in the sediments of the northern California wetland
The prevalence of Clostridium botulinum type C (% of positive sediment samples) was determined in 10 marshes at Sacramento National Wildlife Refuge (SNWR), located in the Central Valley of California (USA), where avian botulism epizootics occur regularly. Fifty-two percent of 2,200 sediment samples collected over an 18-mo period contained C. botulinum type C (both neurotoxic and aneurotoxic) which
Authors
Renee J. Sandler, T.E. Rocke, M. D. Samuel, Thomas M. Yuill
The role of avian carcasses in botulism epizootics
No abstract available.
Authors
T.M. Reed, T.E. Rocke
Brain acetycholinesterase activity in botulism-intoxicated mallards
Brain acetylcholinesterase (AChE) activity in captive-reared mallards (Anas platyrhynchos) that died of botulism was compared with euthanized controls. AChE levels for both groups were within the range reported for normal mallards, and there was no significant difference in mean AChE activity between birds that ingested botulism toxin and died and those that did not.
Authors
T.E. Rocke, M. D. Samuel
Effects of lead shot ingestion on selected cells of the mallard immune system
The immunologic effects of lead were measured in game-farm mallards (Anas platyrhynchos) that ingested lead shot while foraging naturally, mallards intubated with lead shot, and unexposed controls. Circulating white blood cells (WBC) declined significantly in male mallards exposed to lead by either natural ingestion or intubation, but not females. Spleen plaque-forming cell (SPFC) counts were sign
Authors
T.E. Rocke, M. D. Samuel
Blood lead concentrations in mallards from Delevan and Colusa National Wildlife Refuges
Blood samples were taken from 181 (108 adult drakes and 73 individuals of mixed age and sex) mallards, Anas platyrhynchos, from Colusa and Delevan National Wildlife Refuges during late winter and summer of 1987. The percentage of birds with elevated lead concentration was 28.7 for late winter and 16.4 for late summer. For summer trapped birds, a significantly greater proportion of males than femal
Authors
David M. Mauser, Tonie E. Rocke, John G. Mensik, Christopher J. Brand
Experimental Mycoplasma gallisepticum infections in captive-reared wild turkeys
The effects of Mycoplasma gallisepticum (MG) infections on egg production, fertility, and hatchability were studied in captive-reared wild turkeys (Meleagris gallopavo). Three groups of adult birds, each consisting of four hens and two toms, were exposed to MG by the respiratory route at the beginning of their breeding season. Fourteen control birds received sterile growth medium. Although no mort
Authors
Tonie E. Rocke, Thomas M. Yuill, Terry E. Amundson
Serologic response of Rio Grande wild turkeys to experimental infections of Mycoplasma gallisepticum
The serologic response of Rio Grande wild turkeys (Meleagris gallopavo intermedia) to Mycoplasma gallisepticum (MG) was determined. Free-ranging turkeys were caught in southern Texas, shipped to the University of Wisconsin, Madison, and housed in isolation facilities. Fourteen birds were exposed to MG, by intratracheal and intranasal inoculation. Eight birds received sterile broth only. Two wk pri
Authors
Tonie E. Rocke, Thomas M. Yuill
Hematozoan parasites of Rio Grande wild turkeys from southern Texas (USA)
One hundred twenty-three of 300 blood samples (41%) taken from Rio Grande wild turkeys (Meleagris gallopavo intermedia) from three locations in southern Texas (Welder Wildlife Refuge, Chaparrosa Ranch, and Campo Alegre Ranch) and subinoculated into domestic broad-breasted white turkey poults were positive for a Plasmodium (Novyella) sp. Analysis of blood films from 350 turkeys revealed Haemoproteu
Authors
Marc D. Castle, Beth A. Christensen, Tonie E. Rocke
Microbial infections in a declining wild turkey population in Texas
A survey was conducted at 5 locations in Texas for avian pathogens that might adversely affect wild turkey (Meleagris gallopavo) productivity and survival. At 1 site, the Rob and Bessie Welder Wildlife Refuge (WWR), turkeys have declined precipitously in recent years. During the winters of 1983-85, 442 wild turkeys were caught with cannon and drop nets, 161 of these on WWR. Blood samples were draw
Authors
T.E. Rocke, Thomas M. Yuill