Piles of research and doctorates have been done on this issue.
Cull the spikes? Maybe, maybe not.
Taking your observation of not having seen spikes in the past, brings the questions:
Is the overall population in this area higher than in the past?
Is the habitat and food sources becoming degraded locally?
Did the deer have difficulty overwintering last year?
There are many possibilities as to why you are seeing below average horn growth in the yearling bucks, they all relate back to understanding the environmental conditions and population dynamics this herd has experienced recently.
Regarding the sex ratio. A ratio of 1:1 will likely increase the natural buck mortality in the next few years, due to the increased stresses the males will go through in a very competitive rut. Nothing to worry about, some will die, some will live.
To cull for genetic reasons..... Nope.
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