In Belarus, a bison seduced a cow. A lone bison joined the herd of cows, at first the farmers thought of driving him away, but he did not show aggression. And then it turned out that he was intensely courting one cow, and it ended with her giving birth to two calves - crossbreeds of a cow and a bison.
I Out of curiosity, I looked through the articles, as it turned out, during the rut, bison can drive weaker males out of the herd, they walk alone and start to settle down on farms, even to the point that they are not afraid of people and sleep in pens with cows. However, the appearance of such offspring is still rare. They write that one of the calves turned out to be completely wild, he butts the pens and had to be separated. And the second calf is calm and was left with his mother.