Good question. Yes there is a scientific process based on how BO works. Somevof the properties of BO from breast growing notes "Bovine ovaries - Also estrogenic, pro-aromatase, as well as 5-AR inhibiting."
So put most simply, for a complicated process. BO takes your free Testosterone and converts it to Estrogen. Lotus has written up multiple threads on this that explains the process in scientific terms which breaks down the process completely. However, it is not consistent with haw quickly or how efficiently it works for each person. I personally think it's inconsistencies when and how much a person takes as well as diet and other supplements taken with it.
Studies have shown body temp above 98.7 and high protein intake are key to helping the t to e process as well as taking it in the evening because the body does it's e magic when we are sleeping at night.
If I were more tech savvy I would tell you how to find threads that explain it all.
Hope this helps.