I was listening to the Meat Eater podcast a couple of months ago. Fascinating discussion with a biologist who studied blacktail deer from two distinct geographical areas in the USA, one with particularly good genetics for large bodied animals and good heads, the other famous for crap heads.
Essentially, what they found was that genetics had next to nothing to do with it. They took a 1 day old fawn from each area, live captured and raised in a monitored and controlled environment with the same amount of feed/exercise etc. The one from the "good" area grew huge with impressive antlers and the other one never got big or grew real timber. They then mated these stags with captive hinds (from both areas to remove issues around the mother's genetics). Their offspring turned out to be about the same size (huge) and with similar antler size (the stag from the "poor" genetic line had double the antler growth of his dad). They expect that there will be no determinable difference in the two blood lines by the next generation (when considering body size and antler growth).
The conclusion they reached is that the genetics had very little to do with it, and in fact what drove the "good" vs "poor" heads and body size was the gestational nutrition available to the mother. In areas where the pregnant hind has ample feed and nutrients the fawn gets a massive head start, and no matter how good conditions after-birth are, the stag who's mum didn't get as much tucker will never catch up.
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