Below comes from The New Family Receipts Book ©1810
Rules for Milking Cows.
Cows should be milked three times a day, if fully fed, throughout the summer; and great caution should be exercised by the persons employed, to draw the milk from them completely, not only to increase the quantity of produce, but to preserve its quality. Any portion which may be left in the udder seems gradually to be absorbed into the system, and no more is formed than enough to supply the loss of what is taken away ; and, by the continuance of the same mode, a yet farther diminution of the secretion takes place, until at length scarcely any is produced. This last mode of milking is always practised when it is intended that a cow should be rendered dry.