"I have made rawhide quivers from winter and summer killed deer. The winter hide is thicker, maybe to support the heavier thicker hair."
If you consult a wildlife biologist you will find that the hide is thicker in the summer and the fur/hair thicker in the winter as the material baisicaly shifts back and forth so to speak as needed sesonaly, individual skins may vary but the principal is real and biological in nature. I have noticed this trend averaging a few hundred hides over the years, there are exceptions but likely due to variables in the feed,habitat and such of the individual animals but the basic fact is biologicaly solid, I was also told this by a tanner chemist who used to make the tanning kits for Tandy leather in addition to a local game biologist.
If you consult a wildlife biologist you will find that the hide is thicker in the summer and the fur/hair thicker in the winter as the material baisicaly shifts back and forth so to speak as needed sesonaly, individual skins may vary but the principal is real and biological in nature. I have noticed this trend averaging a few hundred hides over the years, there are exceptions but likely due to variables in the feed,habitat and such of the individual animals but the basic fact is biologicaly solid, I was also told this by a tanner chemist who used to make the tanning kits for Tandy leather in addition to a local game biologist.