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 - Weldin Basics, Part 3 - by Curtis von Fange. Oxy-acetylene Welding - Part One In our series on welding we have taken a brief look at AC and DC arc welding along with basic techniques and safety equipment required for safe usage. Since our premise is to cover welding types that might best be used on a farm environment we have kept our overview purposefully simple and general. The second type of welding that this observer finds quite useful in
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