It would be unprecedented, so far as I know. The genetic sequence of androgen and progesterone (among other) receptors have been studied in man and many animals, and the sequence of the binding area is found to be identical. In other words, mutations there have not survived.
These hormones work the same way in man and many animals, definitely including the livestock species. If there is an exception I don’t believe it’s been found.
The argument “it’s progestagenic!” comes from:
-
Amateur attempts to deduce things from not only unproven, but provably wrong structure activity relationship theories. “It’s a 19-nor! So it must be progestagnic!”
-
Seeing a problem and then just announcing that the reason is such and such.
The thing that is really sad about this is that at least part of the claims are SO subject to test. Geez, just have prolactin levels tested, from at least one person using trenbolone from Fina or otherwise definitely proven to be trenbolone! Is that too much to ask of these authors?
And then,
- Making conclusions from the veterinary literature that are not at all being said there and aren’t warranted from it, and sometimes actually in complete contradiction. Mostly, I would imagine, because many of these authors don’t even read the abstract, but saw a given reference listed at the end of some article or book by some author bb’ing steroid author, and decided to copy it for their own similar or extended claim.
So as not to criticize anyone currently in the field: For example, does anyone really imagine Bill Phillips pored through the scientific literature before writing Anabolic Reference Guide, 6th Edition? (By the way, there were no editions 1-5.)