The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
There's the most infamous one is called the Bruce effect, where the introduction of a novel male to a pregnant female animal causes spontaneous miscarriage. And that effect seems to be protected against by the presence of the father.
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This interpretation of this, and I want to really highlight that these are animal studies, but the way this works is that if a pregnant female is in the company of the male that impregnated her, then her young are protected by his scent presence or his pheromone presence. But if he's gone and a novel male shows up, there's a tendency for her to spontaneously miscarry, and essentially for the fetus to be lost.
If you take a pregnant female rodent or mandrill, you take away the father that created those fetuses or fetus, and you introduce the scent of the urine or the fur of a novel male, she will spontaneously abort or miscarry those fetuses, it's a very powerful effect.
in the Bruce effect when you expose a pregnant Mouse at an early critical stage of the pregnanc um I think up to about day three uh if you expose the pregnant Mouse uh to the order of what is referred to in technical terms is the non- stud male that is a male who did not father the pregnancy she will miscarry the pregnancy she will abort it
this effect is remarkably robust and what do I mean by remarkably robust so this will occur on about 80% of exposures now as you know 80% is 100% in biology right I mean there's nothing that happens at more than 80% so it's a remarkably remarkably robust effect this this dropping of the pregnancy and we know it's mediated by chemo sensation through the nose for sure
If you take a pregnant female rodent or mandrel, you take away the father those fetuses or fetus and you introduce the scent of the urine or the fur of a novel male, she will spontaneously abort or misaryry those fetuses.