The groove formed at 18 months tends to be oval shaped on the butting surface; shallow and smooth while the 30 months groove usually forms a notch on the upper part of the outer surface and pronounced bump on the inner surface of butting edge and the butting surface is usually flat.
Counting the ring formed 18 months as “2” assumes the animal dies after June of the following year. If the animal dies in say April the age would be “1” though in its second year of life. An animal with eight annuli is seven until the next May or June. Since most animals harvested in the fall...
The first ring shows all the characteristics of the ring formed at 18 months. The next ring is consistant with the ring formed at 30 months.
Hope this helps
The first thing that stands out is how much weaker the groove is compared to those on either side. The groove in question appears to be part of a pattern that is repeated in several previous growth segments.
I can annotate an image if it would help.
Though a groove completely circling the horn is a characteristic of a true growth ring, it is not unique to true growth grooves. Some false growth grooves also show a strong groove encircling the horn.
I appreciate everyone’s participation in this thread. One thing that has been driven home to me over the past few years is individual variations with these horn characteristics and the consistency of these horns growing in a cylindrical helix.
https://sketchfab.com/3d-models/broomed-1-28c89fe80f924b25b1d2dce5540ba68e
The ram is a pretty clean “seven” - certainly not my general first impression.
Still taking too much time, but getting faster. Hopefully can get the process refined to the point it that it will be feasible to use for educational purposes.