Richie - Thanks for giving a scientific explanation...too often folk's opinions on these topics are based upon wives tales and folklore. Heck, I had a hunter last week tell me his buck was 5 yrs old because it had 10 points and "we all know they put on 2 points every year." Wow...I wonder if that guy thinks the world is flat, too.
I've been surprised at some of the differences I've noted in 1 1/2 yr old bucks throughout the Midwest and the only thing I can attribute it to is the management philosophy (more particularly gun season type/timing) and the effect on the rut. For instance, in Ohio when I was growing up one VERY rarely saw an 18 month old buck that was not at least a 3X4, and most were typical 8 pts. Rare exceptions were generally large 3X3's with an occasional 5X5 with very small G-4's. Moving to Indiana, with a much more harsh gun season (2 full weeks, prime rut, more liberal harvest limits) we have many more forks and spikes around than I'm used to from back home (11 yr observation in IN). The area Dad's farm is in in SE Iowa WAS generally more like Ohio, but has been suffering lately - say last 6-8 yrs - as far as 18 month old bucks go - corresponding with increasing gun "opportunity" including early blackpowder season etc. This train of thought was really brought home to me this year while hunting northeast Missouri where I saw 18 1.5 yr old spike/fork bucks (maybe a couple repeats, but I'm convinced most were distinct bucks) in 7 days. They have a 2 week high power rifle season during the rut. Genetics can't be THAT different across these areas, and all these deer have plenty to eat, similar winters, etc, as the 2 1/2 yr old and older deer from all these places are similar in size. All I can attribute it to is that heavier gun pressure during the rut must spread the breeding over longer periods resulting in many more "short yearlings" or 12-16 month old "1 1/2 yr olds" vs less gun pressure during the rut leading to more true yearlings, and thus better antler growth on a bigger deer the first year.
I guess to answer the original question, after all that ranting would be IMO unless the spike is 2.5 yrs old or older killing him because he is a spike and "will always be" is a mistake. A 3.5 yr old or older spike has to be a VERY rare thing in most areas and I would guess would be a genetic oddity.
Ryan