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The Utilization of Smooth Bromegrass (Bromus inermis) under Rotational and Strip Grazing systems of Pasture Management. II. Digestibility-Intake Studies^{1, 2,}

Departments of Animal Husbandry and Agronomy Alaska Agricultural Experiment Station, Palmer

ABSTRACT

The combined chromium oxide-chromogen technique has been employed to determine the apparent dry matter digestibility and intake of two milking dairy cows grazing smooth bromegrass under rotational and strip grazing systems of pasture management. A fecal sampling and compositing procedure has been described whereby estimates of daily dry matter intake and apparent dry matter digestibility may be obtained without sacrificing the reduction in error gained by analyzing samples composited over 3-day periods. Statistical anatysis of the data has been presented which supports the conclusion that fecal production and milk production, resulting from previous ingestion of pasture herbage, occur simultaneously. A positive correlation between milk production and apparent dry matter digestibility independent of time has been demonstrated under the strip grazing system of management. Estimates of pasture utilization based on digestibility-intake studies, calculated TDN requirements, and clippings made prior to grazing the paddocks were compared. All three estimates of pasture utilization have been shown to have valid applications.

¹ Alaska Agricultural Experiment Station Technical Publication 8.

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.