The only reference I could find gave an age of 4-5 years for all vertebrae:
Schmid, E. 1972. Atlas of animal bones for prehistorians, archaeologists, and Quaternary geologists. Elsevier Publishing Co., New York. 159 pp. (page 75)
I am studying vertebral morphology in North American artiodactyla, and I have noticed that the axis seems to be one of the earlier fusing vertebrae. Unfortunately most of the specimens I have looked at do not include age data, and while I did try to note the general appearence of the epiphyses, I did not record specifically which ones were fused.
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Department of Biological Sciences
University of Texas at El Paso
El Paso TX 79968
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