I have heard of this, but honestly do not know enough about it to comment on whether there is any real evidence in support of it. I can"t really see a reason why it would occur this way, but then the knowledge of many aspects of reproductive genetics is limited.
That said, it is true that for some embryos in non-placental animals (that develop outside of the mother), the local environment around the embryo plays an important role in directing their development. As an example, whether a male or female develops in some species of turtles and other reptiles is determined not by genetics but by the temperature at which their early development occurs.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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