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From my understanding is if the animal is shot it make the center of the deer antler blood read on the inside of the deer tine .
I have deer tines that are blood red and worthless .
Also the ones where the antlers were left out side in the sun , Worthless ...
A bit of background for those who are interested in this phenomenon ...
Antlers are bone, rather than hair or horn (horn is keratin, like fingernails and hooves)... bone has marrow, when it's large enough. As the year progresses from Spring into Summer, and then Fall, the deer grow their antlers. They are covered in a soft layer of skin and fur, and are somewhat sensitive. This skin is called "velvet".
If a deer is killed in this state, the marrow within the antlers is still red with fresh blood, indicating that THIS DEER WAS KILLED OUT OF SEASON. Now, that's not to say that it is a guaranteed illegal deer, as deer get killed out of season by vehicular collisions or animal predation all the time and anybody could have picked up the antlers afterwards, to include the person who hit the deer, as in some states that IS perfectly legal (since the deer damaged your vehicle .... you get to keep what's left of the deer - check with local game warden and police for the laws in your particular area first, before packing a road-killed Bambi into the back of your truck....)
In late Fall, the antlers become mature and the velvet is shredded away by the deer marking their territories ... preparing to fight each other over mates and defend themselves from attack by predators... at this point, the marrow within the antler dies, and turns brown. It will remain this way even after the deer has shed the antlers. Antlers are generally shed one at a time, in somewhat random fashion ... it is very rare to find a matching set in close vicinity to each other (within 50 feet), but fairly common to find them within the same area (square mile or so).
It may be possible to track the life and growth of a deer as it reaches and peaks at maturity by collecting it's shed antlers over the course of it's life ... the antlers will increase in size (length and beam) and number of points, changing it's configuration fairly slowly through each yearly permutation.
As bone is a natural material, it is subject to weathering and decay ... if left out in the elements, sun and rain will weaken the bone structure, and it may be consumed in small amounts or greater, by insects or animals that happen across it .... it is, after all, a good source of calcium. If a shed is not picked up within say, 2 years of it having fallen, for most species, it is probably not going to make for a strong pen body. It could be stabilized, but then it's not just bone anymore ...
There are, of course, exceptions, especially in the colder northern climates .... Alaska and Canada in particular. In some cases, shed antlers that were trampled into the mud decades ago by a herd moving around made it down near the permafrost layer and were preserved by the cold and darkness, being buried.