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Deer vs. Vehicle Crashes Indicative of Population Survival Rate
Wisconsin Ag Connection - 07/02/2014
Following a record-breaking harsh winter, a statewide effort to assess the condition of car-killed deer is helping researchers understand winter's impacts on Wisconsin's deer herd. This information is in addition to radio telemetry monitoring of deer over the last four years has that has also provided insight into winter's impacts on deer.
In general, deer populations in southern Wisconsin came through the winter in better condition than herds in the north, as indicated by fat stores, according to car-killed deer assessments conducted by Department of Natural Resources wildlife officials. This finding coincides with field observations from DNR wildlife biologists throughout the state and reports from the public.
This spring, 522 deer were sampled statewide during a period when fat reserves were at their lowest point of the year. Local wildlife biologists inspected and gathered data from deer that were killed in vehicular collisions to evaluate pregnancy rate and fat stores at various points within the deer carcass, including the rump, around the heart and kidneys and in the bone marrow.
"Last January, we heard a lot of concerns about the potential winter impacts on the deer herd," said Dan Storm, a DNR research ecologist. "From our radio-collared deer studies, we've learned a lot about how winter impacts our northern deer, but we didn't have similar projects in the southern half of the state. Our research and wildlife staff quickly put a plan in place to look at car-killed deer. This was a very inexpensive and informative way for us to monitor winter impacts on deer throughout the state."
Fat stores are a key indicator of nutritional condition as deer rely on these reserves, accumulated during summer and fall, to survive winter. Does with more fat are able to provide better care to their newborns, which increases survival and is important to herd growth rates - fawn survival is closely linked to doe nutritional condition.
In the southern portion of the state, 40 percent of adult deer sampled had rump fat, while rump fat was present in only 14 percent of adult deer sampled in the north. A greater proportion of deer in the north had little or no organ fat, as opposed to deer in the south. Similarly, bone marrow condition was better in the south than the north, and adults were more likely to have fatty marrow than juveniles in both the north and south.
Deer vs. Vehicle Crashes Indicative of Population Survival Rate
Wisconsin Ag Connection - 07/02/2014
Following a record-breaking harsh winter, a statewide effort to assess the condition of car-killed deer is helping researchers understand winter's impacts on Wisconsin's deer herd. This information is in addition to radio telemetry monitoring of deer over the last four years has that has also provided insight into winter's impacts on deer.
In general, deer populations in southern Wisconsin came through the winter in better condition than herds in the north, as indicated by fat stores, according to car-killed deer assessments conducted by Department of Natural Resources wildlife officials. This finding coincides with field observations from DNR wildlife biologists throughout the state and reports from the public.
This spring, 522 deer were sampled statewide during a period when fat reserves were at their lowest point of the year. Local wildlife biologists inspected and gathered data from deer that were killed in vehicular collisions to evaluate pregnancy rate and fat stores at various points within the deer carcass, including the rump, around the heart and kidneys and in the bone marrow.
"Last January, we heard a lot of concerns about the potential winter impacts on the deer herd," said Dan Storm, a DNR research ecologist. "From our radio-collared deer studies, we've learned a lot about how winter impacts our northern deer, but we didn't have similar projects in the southern half of the state. Our research and wildlife staff quickly put a plan in place to look at car-killed deer. This was a very inexpensive and informative way for us to monitor winter impacts on deer throughout the state."
Fat stores are a key indicator of nutritional condition as deer rely on these reserves, accumulated during summer and fall, to survive winter. Does with more fat are able to provide better care to their newborns, which increases survival and is important to herd growth rates - fawn survival is closely linked to doe nutritional condition.
In the southern portion of the state, 40 percent of adult deer sampled had rump fat, while rump fat was present in only 14 percent of adult deer sampled in the north. A greater proportion of deer in the north had little or no organ fat, as opposed to deer in the south. Similarly, bone marrow condition was better in the south than the north, and adults were more likely to have fatty marrow than juveniles in both the north and south.
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