Don't know if this is essential or not but I have found it useful over the years.... This is a formula that was derived from cattle folks who needed to come up with a way of guesstimating the weight of animals on the hoof....
The formula is adjusted for deer and the measurement is taken from just behind the shoulders over the back and then underneath.... You can use a fabric tape of a string and then just measure the string.... It's usually pretty accurate....
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