Buck Scrape research

BSK

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What started as just some mild curiosity has led me down a rabbit hole. I'm in so far I'm going to have to publish this to justify how much time I'm spending on it! At least, if hunters think it is interesting. I originally began discussing this in the Trail Camera Forum, but I thought I should move it here to see what all deer hunters think.

Considering the large volume of trail-camera data I have available from my own property, out of curiosity I began to wonder if there was anything I could learn from looking at the times and days when bucks were photographed visiting scrapes that could be useful as a hunter. To make sure I was comparing apples to apples, I limited my data collection to only times bucks were photographed actually interacting with the scrape. Scrapes are usually created in high deer traffic areas, so sometimes bucks are photographed just wandering through. I wanted to eliminate those and only focus on when bucks come to the scrape itself and interact with it.

As of now, the data is only focused on the last two years, for a couple of reasons. First, I've only been collecting trail-camera data in video mode for the last two years. I didn't want to begin working with still image data just yet. In addition, the last two years are a dramatic contrast. 2020 was a very poor acorn year. On the other hand, 2021 was a bumper acorn year. As hunters, we definitely notice differences in our buck sightings based on acorn availability. But would there be any differences between the two years in scraping activity timing because of the difference in acorn production?

So here is some early data. In these "scrape visits by date" graphs, the blue line is the day to day number of scrape visits caught on camera. The thicker red line is a 5-day running mean, which is a statistical process used to smooth out highly variable day to day swings to more accurately display the statistical trend. The orange line is actual buck-doe chases caught on scrape cameras. The 2021 data ends December 17 because I haven't picked up the last data for the year.
 

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BSK

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The below graph is the 5-day running means for the two years laid over the top of each other. Before I analyzed the data, I expected to see similar patterns in peak scraping days, but that those peak days would be offset by about a week to 10 days. I've always believed our entire breeding process is earlier in a good acorn year versus a poor acorn year. However, so far the data does not suggest this is true. The peak days of bucks photographed chasing does is about the same. The one big difference is the much earlier and higher spike of scraping in a good acorn year just before peak breeding (which appears to be somewhere around Nov. 13-20 both years). In fact, I kind of find it interesting how peaks and valleys in activity sort of line up between the two years.
 

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BSK

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Now probably the more interesting data is the time of day bucks worked scrapes. Below is the data for both 2020 and 2021. To make the data comparable, I graphed it hour by hour as a percent of total visits. If the time of day has no bearing on when bucks work scrapes, the graph would be a flat line across all hours of the day at 4.17% (each hour is 4.17% of 24 total hours). Yet the data clearly shows bucks have preferences for the time of day they work scrapes - primarily dawn, dusk, and at night. But what I find most interesting is how much more scrape-visiting occurred during daylight hunting hours in 2020, a bad acorn year, than in 2021, a good acorn year. In 2020 a significant peak of activity occurred 7 AM to 11 AM. Also scraping peaked 4 to 5 PM, which is still daylight. However, in the good acorn year of 2021, the peak was only in the first hour of daylight, 6 to 7 AM, and then fell off rapidly. And the evening peak did not occur until after dark (5-6 PM).
 

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BSK

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As I started on the 2021 data, I got the "brilliant" idea of recording all the data based on the age of the buck. To make matters simple, I just broke down the ages into the three main categories for behavior (as biologists see them). So I recorded the data for yearling bucks, middle-aged bucks (2 1/2 and 3 1/2 year-olds), and mature bucks (4 1/2+ year-olds).

My first time-of-day analysis was to break down visits by time for yearling bucks versus all older bucks. This showed a marked preference for yearling bucks visiting scrapes more in daylight than older bucks. In addition, older bucks peak visiting scrapes between midnight and 2 AM, while yearlings peak in the first hour of daylight (6 AM to 7 AM). The peak of visits just after dark was slightly different as well with yearlings peaking 5-6 PM and older bucks 6-7 PM.
 

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BSK

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Breaking the times down further for the three different age classifications showed something very interesting. Although mature bucks do the majority of their scrape-visiting at night, there was that interesting peak between 7-8 AM.
 

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BSK

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Now here is some odd data I don't know what to make of. Interesting, but does it mean anything? Below is a graph of 2021's scrape visits by date (5 day running mean) looking at the percent of visits that are just older bucks. I have no idea why the percentage of scrape visits by older bucks increases to a peak and then begins to decline. Thoughts? Why would yearling bucks decrease or stop their scrape visits for a period of time?
 

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Ski

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But what I find most interesting is how much more scrape-visiting occurred during daylight hunting hours in 2020, a bad acorn year, than in 2021, a good acorn year. In 2020 a significant peak of activity occurred 7 AM to 11 AM. Also scraping peaked 4 to 5 PM, which is still daylight. However, in the good acorn year of 2021, the peak was only in the first hour of daylight, 6 to 7 AM, and then fell off rapidly. And the evening peak did not occur until after dark (5-6 PM).

That is incredibly interesting. Thank you for posting that. I've always heard deer are slaves to their stomach, but never equated it to scraping. Makes sense. Does have to be on their feet traveling more when acorns are scarce, and the bucks will shadow them. 2021 shows a much lazier line than 2020.
 

JCDEERMAN

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Amazing stuff! I'd like to go through and do the same with our pics/videos. Thanks for pulling all of this together and sharing!
 

BSK

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Biggest problem is the differences in activity between bucks by age in 2021 was so interesting, I'm going to have to go back through the 2020 data to separate everything by age as well.
 

BSK

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Once I'm finished getting the age data for 2020, my next project is analyzing buck behaviors at the scrape. For each scrape visit I recorded whether the buck worked the overhanging limb and whether he reopened the scrape (actually scraped the ground). I believe there are some VERY interesting tidbits hidden in that data. As a teaser, it appears yearling bucks conduct the least amount of listed behaviors, and very little actual reopening of the scrape compared to older bucks. However, yearling appeared to do more actual scraping in the good acorn year versus the poor acorn year.

There also appeared to be a "lull" in actual scrape reopening during the season by all age bucks. In essence, a period of time when most visits were just working the overhanging limb but not scraping the ground.
 

TheLBLman

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This is good data, but I'm wondering how we record bucks scent-checking scrapes from a distance often too far to trigger a camera trap?

Since I'm not on stand at night, this is only my theory, but I believe older bucks (during daylight) are more likely to just scent-check from a distance, and not "interact" with the scrape or the overhanging limbs, yet they did "check" the scrape.
 

peytoncreekhunter

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BSK, did you record the frequency of visits by individual bucks in any time frame? Say like how many times individual bucks visited the scrape in 48 hrs. or whatever time frame.

It would interesting to see if certain bucks visited scrapes more than others. Maybe because of age group or just one buck likes the ladies a little more than others.....
 

peytoncreekhunter

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Did you record the number of times the same buck visits the scrape say in a 24/48hr or more period.

I think it would interesting to see the frequency of visits that bucks check the scrapes.

If I missed that in your data forgive me.
 

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