After having one abortion and one IUD insertion, I can tell you firsthand that this is a brutal procedure for anyone to endure, let alone a powerless cow whose head is chained.
Here is what's going on:
He is stabilizing her cervix through the rectum, grabbing it through the walls with a full hand.
He is inserting the long wand into the vagina and up through the cervix, to the inject sperm in the uterus.
Passing this rod through the cervical canal is HORRIFICALLY PAINFUL.
I REPEAT, FORCING A FOREIGN BODY UP THE DENSE, TIGHT CANAL OF THE CERVIX IS HORRIFICALLY PAINFUL. That canal is mean for outflow: excretions, babies. Upflow is naturally permitted only to liquids. The cervix is a TIGHT, FIRM, DENSE, NARROW passageway. Entry, up the wrong way of this tight outspout causes "the worst cramps of your life". It's like your whole body is under siege from a hot white thousand pound pressurized flame, some mashing horrible pressure, unfathomable.