The crazy low temperatures are surely going to have an impact on the deer herd. Does anyone know what the statistics are on such cold weather and deer mortality? How long can they live with suck extremely low temperatures?
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super cold weather and deer
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Re: super cold weather and deer
Not sure how long deer can survive in this weather but the DNR in Wisconsin uses a Winter Severity Index. Here is how is a brief summary of this from Minnesota.
The Winter Severity Index (WSI) is a
general measure of winter conditions
based on the premise that prolonged
cold temperatures and deep snow
can reduce overwinter survival of
white-tailed deer. In Minnesota the
WSI is calculated by accumulating a
point for each day with an ambient
temperature <= 0 degrees F and an
additional point for each day with a
snow depth >= 15".
Temperature and snow depth data
are provided by the MN Climatology
Working Group.
They then rate the winter as mild, moderate, severe or very severe.
The Winter Severity Index (WSI) is a
general measure of winter conditions
based on the premise that prolonged
cold temperatures and deep snow
can reduce overwinter survival of
white-tailed deer. In Minnesota the
WSI is calculated by accumulating a
point for each day with an ambient
temperature <= 0 degrees F and an
additional point for each day with a
snow depth >= 15".
Temperature and snow depth data
are provided by the MN Climatology
Working Group.
They then rate the winter as mild, moderate, severe or very severe.
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Re: super cold weather and deer
Right now not looking good for how early in winter these temps have hit us
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- Dewey
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Re: super cold weather and deer
The cold doesn't bother them much as long as it doesn't last for weeks at a time and the snow depth isn't over 18". Up north I am amazed the temps deer can survive in for rather long periods. Right now they will be fine. When the winter drags on like it did last year that is when they get really stressed because their fat reserves are pretty much gone.
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- Dewey
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Re: super cold weather and deer
This is an explanation from WI DNR website.
1996-97 was a very bad year and I remember that well. Spring scouting in northern WI and MI UP was not a pretty sight. Dead deer everywhere!
http://dnr.wi.gov/topic/wildlifehabitat ... ts/wsi.pdf
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1996-97 was a very bad year and I remember that well. Spring scouting in northern WI and MI UP was not a pretty sight. Dead deer everywhere!
http://dnr.wi.gov/topic/wildlifehabitat ... ts/wsi.pdf
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Re: super cold weather and deer
I would think as long as they can get food, they would be ok. not a lot of snow here in southern wi.
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Re: super cold weather and deer
I hate to see bitter cold and deep snow. Not good for the deer.
You can fool some of the bucks, all of the time, and fool all of the bucks, some of the time, however you certainly can't fool all of the bucks, all of the time.
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Re: super cold weather and deer
Dewey wrote:The cold doesn't bother them much as long as it doesn't last for weeks at a time and the snow depth isn't over 18". Up north I am amazed the temps deer can survive in for rather long periods. Right now they will be fine. When the winter drags on like it did last year that is when they get really stressed because their fat reserves are pretty much gone.
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X2... Right on..
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Obsession Bows
Lone Wolf Alpha and sticks
Lone Wolf Alpha and sticks
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Re: super cold weather and deer
NH has fluctuated the deer herd numbers on "BAD" winter dynamics in the past by as much as 30% - usually takes 2-3 years to bump back up - not good...
Expect the Unexpected when you least Expect it...
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Re: super cold weather and deer
When my daughter hunted at Sandhill Wildlife Area this fall we had a listen to a deer biologist talk on this. He stated that days below zero and days with 12 inches or more of snow on the ground affected the deer population more than any other factor. Right now there is also a pretty good crust of ice under the snow we have. That has to make it harder for them to dig down for food. However, if the weather swings and the snow melts the whole thing could change. I agree that a winter that drags on is the worst possible scenario.
chris
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Re: super cold weather and deer
I spoke with an Upper Peninsula Deer biologist about this last year after our late, late snowstorms last year.
The below zero days posted above are accurate,,there is a formula they use which determines "cold days" (my description).
Once winter has set and deer have yarded, the deer have "x" amount of days before they start dying..I think was about 90 days. I would have to look. The deer metabolism slows way down etc..If this time elapses without greenup or at least significant snowmelt making browse available fetuses are aborted and die offs begin in significant numbers.
Interestingly enough, long term studies have shown that twin fawn birth rates skyrocket the next fawning year. Does that aborted but survived enter the spring with no lactation pressure or fawn rearing stress and enter the next rut in excellent condition. This is why a bad winter every other winter or three in a row will cause a massive population crash as opposed to individual or back to back bad winters,,or so I'm told..
I'll find that study and post it in a separate thread.
The below zero days posted above are accurate,,there is a formula they use which determines "cold days" (my description).
Once winter has set and deer have yarded, the deer have "x" amount of days before they start dying..I think was about 90 days. I would have to look. The deer metabolism slows way down etc..If this time elapses without greenup or at least significant snowmelt making browse available fetuses are aborted and die offs begin in significant numbers.
Interestingly enough, long term studies have shown that twin fawn birth rates skyrocket the next fawning year. Does that aborted but survived enter the spring with no lactation pressure or fawn rearing stress and enter the next rut in excellent condition. This is why a bad winter every other winter or three in a row will cause a massive population crash as opposed to individual or back to back bad winters,,or so I'm told..
I'll find that study and post it in a separate thread.
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Re: super cold weather and deer
Winter kills are not pretty...but remember they are mother nature's way of controlling populations. I know we as hunters like larger populations but keep in mind in the big picture its not about us.
As others have mentioned, cold and heavy snow in February and March are what causes winter kills. They can take this cold and snow in December/January as long as it doesn't drag on another 2 months.
As others have mentioned, cold and heavy snow in February and March are what causes winter kills. They can take this cold and snow in December/January as long as it doesn't drag on another 2 months.
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