The bottom part of every yoke is to be as long as the swine (standing upon his fore feet) is high from the ground to the top of his shoulder; and sticks that are placed up and down through the yoke are to be six inches higher than the neck and three inches lower than the bottom of the yoke that is usually placed acrosswise under his throat (for all swine of a year old and upward, and so proportionably for all swine that are younger) ; only the fine on abovesaid penalty [6d.] shall not be required or paid above once in one day.
Source: wiktionary