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The Utilization of Smooth Bromegrass (Bromus inermis) under Rotational and Strip Grazing Systems of Pasture Management. III. Animal Behavior^{1, 2,}

Department of Animal Husbandry, Alaska Agricultural Experiment Station, Palmer

ABSTRACT

Nine continuous behavior observations have been conducted on two groups of dairy cows grazing smooth bromegrass under rotational and strip grazing systems of management. The total grazing time of both groups increased with advancing season. This has been attributed to increasing plant maturity during initial grazing and to soiling and reduced available herbage during subsequent grazing. Advancing season also resulted in an increase in initial grazing time for the group under the strip grazing system. This was apparently satisfactory compensation for reduced palatability and availability, for afternoon grazing activity remained relatively constant over the experiment. The pattern of grazing activity for the rotationally grazed animals was influenced by the degree of previous defoliation of a paddock prior to the observation in addition to advancing season. When grazing a nearly depleted area, the period of intense grazing activity was shifted to the afternoon.

¹ Alaska Agricultural Experiment Station Technical Publication 9.

² Data presented are from a thesis submitted by A. L. Brundage to the Graduate Faculty of the University of Minnesota in partial fulfillment of the requirements for a Doctor of Philosophy degree.