Some Observations on the Behavior of Grazing Lactating Cows

Abstract
Grazing habits and related activities of lactating Holstein cows were recorded for two periods of 240 consecutive hours each with the following results obtained (per cow per 24 hour): standing time, 900 minutes; lying down time, 540 minutes; loafing time, 358 minutes; grazing time, 542 minutes; ruminating time, 518 minutes; defecations, 15; urinations, 9.4; drinks, 3.9. Grazing time was divided approximately equal between the A.M. - P.M. and P.M. -A.M. milkings; however, high environmental temperatures were observed to increase night grazing. Results are discussed from the standpoint of pasture management.